---
title: "Word sense disambiguation — definition and key papers"
description: "Word sense disambiguation (WSD) identifies which meaning of an ambiguous word is intended in a given context."
canonical: "https://research.elamur.ai/free/en/concepts/word-sense-disambiguation/"
---
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# 🔀 Word sense disambiguation

Concept · 30 key papers · [all concepts](https://md.research.elamur.ai/free/en/concepts/)

Word sense disambiguation (WSD) identifies which meaning of an ambiguous word is intended in a given context. It is usually framed as picking one entry from a fixed sense inventory, such as the synsets of WordNet.

Also: WSD, lexical ambiguity resolution, sense tagging, lexical disambiguation

## What it is

Many frequent words carry several meanings. *Bank* can name a financial institution or the side of a river, and *plant* can be a living organism or a factory. A WSD system reads the surrounding text and assigns the appropriate meaning to each occurrence. Ide and Véronis described it as an "intermediate" task. It is seldom an end in itself, but machine translation, information retrieval, content analysis, parsing and speech processing all depend on resolving ambiguity ([Ide & Véronis 1998](https://md.research.elamur.ai/free/en/papers/ide-1998-introduction-special-issue-word-sense/)).

The task requires an inventory that lists the possible senses. In English this is most often WordNet, where each sense is a synset with a short definition (gloss). WordNet draws very fine distinctions, and human annotators disagree often. Reported inter-annotator agreement on the Senseval-3 all-words test set was 72.5%, which places a practical ceiling near 70% for fine-grained WSD ([Navigli 2006](https://md.research.elamur.ai/free/en/papers/navigli-2006-meaningful-clustering-senses-helps-boost/)). Coarser alternatives exist for this reason:

- WordNet senses can be clustered by mapping them onto the coarser, hierarchically organised senses of the Oxford Dictionary of English ([Navigli 2006](https://md.research.elamur.ai/free/en/papers/navigli-2006-meaningful-clustering-senses-helps-boost/)).
- Nouns and verbs can be tagged with the 41 lexicographer "supersense" classes ([Ciaramita & Altun 2006](https://md.research.elamur.ai/free/en/papers/ciaramita-2006-broad-coverage-sense-disambiguation-information/)).

Evaluations come in two settings. In the lexical-sample setting, only a few selected words are tested. In the all-words setting, every content word in running text is disambiguated. A common reference point is the first-sense baseline, which always picks the sense WordNet lists first. For English, that is the sense most frequent in hand-tagged text ([Agirre et al. 2014](https://md.research.elamur.ai/free/en/papers/agirre-2014-random-walks-knowledge-based-word/)). A sibling task, word sense induction, discovers senses from raw text without any inventory ([Brody & Lapata 2009](https://md.research.elamur.ai/free/en/papers/brody-2009-bayesian-word-sense-induction/); [Manandhar et al. 2010](https://md.research.elamur.ai/free/en/papers/manandhar-2010-semeval-2010-task-14-word/)).

## The key idea

All approaches exploit the same intuition: the words around an ambiguous word reveal its meaning. Methods differ in where the evidence about each sense comes from. Knowledge-based methods use dictionaries, thesauri or lexical graphs. Supervised methods learn from sense-tagged examples. Unsupervised methods rely on untagged corpora ([Ide & Véronis 1998](https://md.research.elamur.ai/free/en/papers/ide-1998-introduction-special-issue-word-sense/)).

The classic knowledge-based mechanism is the Lesk algorithm (Lesk, 1986). It chooses the sense whose dictionary definition shares the most words with the context. Its simplified form is:

```
ŝ = argmax over s in Senses(w) of | Gloss(s) ∩ Context(w) |
```

Here w is the target word and Senses(w) is its set of candidate senses in the inventory. Gloss(s) is the set of content words in the definition of sense s, and Context(w) is the set of content words around w. The bars denote the size of the intersection, and ŝ is the chosen sense.

As a worked example, take "the pine cone fell from the evergreen tree." Suppose *cone* has two glosses: "solid body narrowing to a point from a round base" and "fruit of certain evergreen trees." The context words {pine, fell, evergreen, tree} share nothing with the first gloss. They share *evergreen* with the second, and also *tree* once *trees* is reduced to its lemma, so the fruit sense wins.

The original method matches the definitions of each sense of the target against the definitions of the surrounding words. The simplified version compares glosses directly with the context. Both fail when definitions and context use different words for the same thing. Later work softens this by enlarging glosses with related senses and scoring them by distributional similarity instead of exact overlap ([Basile et al. 2014](https://md.research.elamur.ai/free/en/papers/basile-2014-enhanced-lesk-word-sense-disambiguation/)).

Two other core mechanisms recur in the field:

- Decision lists rank contextual clues by log-likelihood and label each instance using only the single strongest matching clue ([Yarowsky 1994](https://md.research.elamur.ai/free/en/papers/yarowsky-1994-decision-lists-lexical-ambiguity-resolution/)).
- Graph methods turn candidate senses into vertices linked by lexical relations. They then run PageRank, commonly with the damping factor set to 0.85, so that senses supported by the rest of the text rise to the top ([Mihalcea et al. 2004](https://md.research.elamur.ai/free/en/papers/mihalcea-2004-pagerank-semantic-networks-application-word/); [Mihalcea 2005](https://md.research.elamur.ai/free/en/papers/mihalcea-2005-unsupervised-large-vocabulary-word-sense/)).

## History and founding papers

The problem was first raised in machine translation, in Weaver's memorandum. Kaplan found in 1950 that translators resolved ambiguity about as well from two words on each side as from the whole sentence. Bar-Hillel's 1960 "box in the pen" argument held that automatic disambiguation was out of reach, and this view fed into the ALPAC report of 1966. Masterman's Roget-based system, which looked for overlapping thesaurus heads, anticipated knowledge-based WSD ([Ide & Véronis 1998](https://md.research.elamur.ai/free/en/papers/ide-1998-introduction-special-issue-word-sense/)).

Statistical methods arrived in the early 1990s. Brown and colleagues defined senses by the translations they predict, learned them from the Canadian Hansard, and cut a translation system's error rate by 13% ([Brown et al. 1991](https://md.research.elamur.ai/free/en/papers/brown-1991-word-sense-disambiguation-statistical-methods/)). Yarowsky trained one model per Roget category on encyclopedia text and reached 92% accuracy on 12 polysemous words ([Yarowsky 1992](https://md.research.elamur.ai/free/en/papers/yarowsky-1992-word-sense-disambiguation-statistical-models/)). Dagan and Itai counted syntactic co-occurrences in a target-language corpus, testing on Hebrew and German source text. On the Hebrew–English data, their method decided 70% of ambiguous words and was correct in 91% of those decisions ([Dagan & Itai 1994](https://md.research.elamur.ai/free/en/papers/dagan-1994-word-sense-disambiguation-second-language/)).

Yarowsky's 1995 bootstrapping algorithm became an influential, minimally supervised method. It needs only a few seed collocations and otherwise learns from untagged text. It grows a decision list from those seeds, guided by two regularities:

- One sense per discourse: in hand-tagged data, repeated occurrences of a word in one document kept the majority sense about 99.8% of the time.
- One sense per collocation: nearby words are strong, consistent signals of sense.

With the discourse constraint added, the method reached 96.5%. That edged past the 96.1% of a supervised decision list ([Yarowsky 1995](https://md.research.elamur.ai/free/en/papers/yarowsky-1995-unsupervised-word-sense-disambiguation-rivaling/)).

In 1997, Resnik and Yarowsky criticised the lack of shared evaluation. They proposed probability-sensitive scoring and inventories limited to distinctions that languages lexicalise differently. These ideas shaped the later shared tasks ([Resnik & Yarowsky 1997](https://md.research.elamur.ai/free/en/papers/resnik-1997-perspective-word-sense-disambiguation-methods/)).

The Senseval campaigns, later renamed SemEval, then provided common data:

| Benchmark | Representative result |
| --- | --- |
| Senseval-1/2 lexical sample | Linear SVM with four knowledge sources: 79.2% recall on Senseval-1, 65.4% on Senseval-2 ([Lee & Ng 2002](https://md.research.elamur.ai/free/en/papers/lee-2002-empirical-evaluation-knowledge-sources-learning/)) |
| Senseval-3 all-words | First-sense baseline of 62.40%; only 4 of 26 systems beat it ([Ciaramita & Altun 2006](https://md.research.elamur.ai/free/en/papers/ciaramita-2006-broad-coverage-sense-disambiguation-information/)) |
| SemEval-2010 induction | 100 target words; metrics disagreed on rankings ([Manandhar et al. 2010](https://md.research.elamur.ai/free/en/papers/manandhar-2010-semeval-2010-task-14-word/)) |

Knowledge-based work during the same period moved to graphs over WordNet. One example is PageRank over sense graphs ([Mihalcea et al. 2004](https://md.research.elamur.ai/free/en/papers/mihalcea-2004-pagerank-semantic-networks-application-word/)). Another is sequence labeling with gloss-overlap edges, which reached 54.2% on Senseval-2 ([Mihalcea 2005](https://md.research.elamur.ai/free/en/papers/mihalcea-2005-unsupervised-large-vocabulary-word-sense/)). Navigli and Lapata compared connectivity measures and found local measures such as KPP (Key Player Problem) most reliable ([Navigli & Lapata 2007](https://md.research.elamur.ai/free/en/papers/navigli-2007-graph-connectivity-measures-unsupervised-word/)). Personalized PageRank over the full WordNet graph, released as UKB, also belongs to this line ([Agirre et al. 2014](https://md.research.elamur.ai/free/en/papers/agirre-2014-random-walks-knowledge-based-word/)).

## How it is used today

Neural supervised systems now dominate English all-words WSD. They are trained mainly on SemCor, a part of the Brown Corpus hand-tagged with WordNet senses ([Basile et al. 2014](https://md.research.elamur.ai/free/en/papers/basile-2014-enhanced-lesk-word-sense-disambiguation/)). They are evaluated in a unified framework that merges the Senseval and SemEval datasets ([Raganato et al. 2017](https://md.research.elamur.ai/free/en/papers/raganato-2017-word-sense-disambiguation-unified-evaluation/)). Scores are usually given as F1, the harmonic mean of precision and recall. The leading systems combine contextual encoders with knowledge from the inventory:

- GlossBERT pairs each context with every candidate gloss as a sentence-pair task. It reached 77.0 F1 on the combined test sets ([Huang et al. 2019](https://md.research.elamur.ai/free/en/papers/huang-2019-glossbert-bert-word-sense-disambiguation/)).
- LMMS spreads BERT-derived sense vectors through WordNet to cover all of its senses, so a nearest-neighbour match works without a most-frequent-sense fallback ([Loureiro & Jorge 2019](https://md.research.elamur.ai/free/en/papers/loureiro-2019-language-modelling-makes-sense-propagating/)).
- EWISER propagates scores along WordNet edges and was the first to exceed 80 F1 on the combined benchmark ([Bevilacqua & Navigli 2020](https://md.research.elamur.ai/free/en/papers/bevilacqua-2020-breaking-through-80-glass-ceiling/)).
- A gloss-informed bi-encoder was evaluated on the same English all-words benchmark. On less frequent senses, it cut error by 31.1% relative to prior work, which is 15.6 F1 above the nearest rival ([Blevins & Zettlemoyer 2020](https://md.research.elamur.ai/free/en/papers/blevins-2020-moving-down-long-tail-word/)).

Knowledge-based methods remain useful where annotated data are lacking, because they need only a wordnet ([Agirre et al. 2014](https://md.research.elamur.ai/free/en/papers/agirre-2014-random-walks-knowledge-based-word/)). They also extend naturally to joint entity linking and disambiguation ([Moro et al. 2014](https://md.research.elamur.ai/free/en/papers/moro-2014-entity-linking-meets-word-sense/)).

In translation, WSD helped once senses were redefined as target phrases learned from aligned corpora. This idea was developed in word-translation work ([Vickrey et al. 2005](https://md.research.elamur.ai/free/en/papers/vickrey-2005-word-sense-disambiguation-machine-translation/)) and then in phrase-based and hierarchical systems ([Carpuat & Wu 2007](https://md.research.elamur.ai/free/en/papers/carpuat-2007-improving-statistical-machine-translation-word/); [Chan et al. 2007](https://md.research.elamur.ai/free/en/papers/chan-2007-word-sense-disambiguation-improves-statistical/)). Parallel text can also replace manual sense tagging as a source of training data ([Ng et al. 2003](https://md.research.elamur.ai/free/en/papers/ng-2003-exploiting-parallel-texts-word-sense/)). For German→English and German→French neural translation, the ContraWSD contrastive test found baseline accuracy of about 70%, with weak handling of rare senses ([Gonzales et al. 2017](https://md.research.elamur.ai/free/en/papers/gonzales-2017-improving-word-sense-disambiguation-neural/)). Induced senses are also used to cluster and diversify web search results ([Marco & Navigli 2013](https://md.research.elamur.ai/free/en/papers/marco-2013-clustering-diversifying-web-search-results/)).

## Open questions

Granularity remains unresolved. If fine WordNet distinctions cap human agreement, it is unclear what the right inventory is for a given application ([Navigli 2006](https://md.research.elamur.ai/free/en/papers/navigli-2006-meaningful-clustering-senses-helps-boost/)).

The long tail is a second problem. The bi-encoder still scores more than 40 F1 points higher on most-frequent-sense examples than on less frequent ones ([Blevins & Zettlemoyer 2020](https://md.research.elamur.ai/free/en/papers/blevins-2020-moving-down-long-tail-word/)).

Evaluation is still debated. Exact-match accuracy ignores calibrated uncertainty ([Resnik & Yarowsky 1997](https://md.research.elamur.ai/free/en/papers/resnik-1997-perspective-word-sense-disambiguation-methods/)), and conclusions about sense induction depend heavily on the chosen metric ([Manandhar et al. 2010](https://md.research.elamur.ai/free/en/papers/manandhar-2010-semeval-2010-task-14-word/)).

Extrinsic value is uncertain. Early studies found mixed gains in information retrieval ([Ide & Véronis 1998](https://md.research.elamur.ai/free/en/papers/ide-1998-introduction-special-issue-word-sense/)). In translation, significant gains came only after senses were recast as translations ([Carpuat & Wu 2007](https://md.research.elamur.ai/free/en/papers/carpuat-2007-improving-statistical-machine-translation-word/); [Chan et al. 2007](https://md.research.elamur.ai/free/en/papers/chan-2007-word-sense-disambiguation-improves-statistical/)). Sense-aware neural systems improved only modestly and left BLEU essentially unchanged ([Gonzales et al. 2017](https://md.research.elamur.ai/free/en/papers/gonzales-2017-improving-word-sense-disambiguation-neural/)).

Coverage is a further concern. Fixed inventories miss newly emerging senses, which induction methods can help detect ([Lau et al. 2012](https://md.research.elamur.ai/free/en/papers/lau-2012-word-sense-induction-novel-sense/)). Many languages also lack frequency-ordered sense lists, so the first-sense baseline is far weaker there than in English ([Agirre et al. 2014](https://md.research.elamur.ai/free/en/papers/agirre-2014-random-walks-knowledge-based-word/)).

## Key papers

The works this page cites, the most cited first; citations as counted by OpenAlex plus the papers of this library that cite the work, read 2026-10-23.

- [Unsupervised Word Sense Disambiguation Rivaling Supervised Methods](https://md.research.elamur.ai/free/en/papers/yarowsky-1995-unsupervised-word-sense-disambiguation-rivaling/) — David Yarowsky · 1995 · 2,840 citations
- [Word-Sense Disambiguation Using Statistical Models of Roget's Categories Trained on Large Corpora](https://md.research.elamur.ai/free/en/papers/yarowsky-1992-word-sense-disambiguation-statistical-models/) — David Yarowsky · 1992 · 782 citations
- [Introduction to the Special Issue on Word Sense Disambiguation: The State of the Art](https://md.research.elamur.ai/free/en/papers/ide-1998-introduction-special-issue-word-sense/) — Nancy Ide, Jean Véronis · 1998 · 740 citations
- [Unsupervised Large-Vocabulary Word Sense Disambiguation with Graph-based Algorithms for Sequence Data Labeling](https://md.research.elamur.ai/free/en/papers/mihalcea-2005-unsupervised-large-vocabulary-word-sense/) — Rada Mihalcea · 2005 · 582 citations
- [Improving Statistical Machine Translation Using Word Sense Disambiguation](https://md.research.elamur.ai/free/en/papers/carpuat-2007-improving-statistical-machine-translation-word/) — Marine Carpuat, Dekai Wu · 2007 · 505 citations
- [Word Sense Disambiguation: A Unified Evaluation Framework and Empirical Comparison](https://md.research.elamur.ai/free/en/papers/raganato-2017-word-sense-disambiguation-unified-evaluation/) — Alessandro Raganato, Jose Camacho-Collados, Roberto Navigli · 2017 · 483 citations
- [Word-Sense Disambiguation Using Statistical Methods](https://md.research.elamur.ai/free/en/papers/brown-1991-word-sense-disambiguation-statistical-methods/) — Peter F. Brown, Stephen A. Della Pietra, Vincent J. Della Pietra et al. · 1991 · 464 citations
- [DECISION LISTS FOR LEXICAL AMBIGUITY RESOLUTION: Application to Accent Restoration in Spanish and French](https://md.research.elamur.ai/free/en/papers/yarowsky-1994-decision-lists-lexical-ambiguity-resolution/) — David Yarowsky · 1994 · 441 citations
- [Word Sense Disambiguation Improves Statistical Machine Translation](https://md.research.elamur.ai/free/en/papers/chan-2007-word-sense-disambiguation-improves-statistical/) — Yee Seng Chan, Hwee Tou Ng, David Chiang · 2007 · 415 citations
- [GlossBERT: BERT for Word Sense Disambiguation with Gloss Knowledge](https://md.research.elamur.ai/free/en/papers/huang-2019-glossbert-bert-word-sense-disambiguation/) — Luyao Huang, Chi Sun, Xipeng Qiu et al. · 2019 · 364 citations
- [Random Walks for Knowledge-Based Word Sense Disambiguation](https://md.research.elamur.ai/free/en/papers/agirre-2014-random-walks-knowledge-based-word/) — Eneko Agirre, Oier López de Lacalle, Aitor Soroa · 2014 · 359 citations
- [Word Sense Disambiguation Using a Second Language Monolingual Corpus](https://md.research.elamur.ai/free/en/papers/dagan-1994-word-sense-disambiguation-second-language/) — Ido Dagan, Alon Itai · 1994 · 344 citations
- [An Empirical Evaluation of Knowledge Sources and Learning Algorithms for Word Sense Disambiguation](https://md.research.elamur.ai/free/en/papers/lee-2002-empirical-evaluation-knowledge-sources-learning/) — Yoong Keok Lee, Hwee Tou Ng · 2002 · 302 citations
- [Broad-Coverage Sense Disambiguation and Information Extraction with a Supersense Sequence Tagger](https://md.research.elamur.ai/free/en/papers/ciaramita-2006-broad-coverage-sense-disambiguation-information/) — Massimiliano Ciaramita, Yasemin Altun · 2006 · 295 citations
- [PageRank on Semantic Networks, with Application to Word Sense Disambiguation](https://md.research.elamur.ai/free/en/papers/mihalcea-2004-pagerank-semantic-networks-application-word/) — Rada Mihalcea, Paul Tarau, Elizabeth Figa · 2004 · 248 citations
- [Word-Sense Disambiguation for Machine Translation](https://md.research.elamur.ai/free/en/papers/vickrey-2005-word-sense-disambiguation-machine-translation/) — David Vickrey, Luke Biewald, Marc Teyssier et al. · 2005 · 242 citations
- [Bayesian Word Sense Induction](https://md.research.elamur.ai/free/en/papers/brody-2009-bayesian-word-sense-induction/) — Samuel Brody, Mirella Lapata · 2009 · 234 citations
- [Breaking Through the 80% Glass Ceiling: Raising the State of the Art in Word Sense Disambiguation by Incorporating Knowledge Graph Information](https://md.research.elamur.ai/free/en/papers/bevilacqua-2020-breaking-through-80-glass-ceiling/) — Michele Bevilacqua, Roberto Navigli · 2020 · 232 citations
- [Moving Down the Long Tail of Word Sense Disambiguation with Gloss Informed Bi-encoders](https://md.research.elamur.ai/free/en/papers/blevins-2020-moving-down-long-tail-word/) — Terra Blevins, Luke Zettlemoyer · 2020 · 232 citations
- [Meaningful Clustering of Senses Helps Boost Word Sense Disambiguation Performance](https://md.research.elamur.ai/free/en/papers/navigli-2006-meaningful-clustering-senses-helps-boost/) — Roberto Navigli · 2006 · 213 citations
- [Exploiting Parallel Texts for Word Sense Disambiguation: An Empirical Study](https://md.research.elamur.ai/free/en/papers/ng-2003-exploiting-parallel-texts-word-sense/) — Hwee Tou Ng, Bin Wang, Yee Seng Chan · 2003 · 209 citations
- [SemEval-2010 Task 14: Word Sense Induction &Disambiguation](https://md.research.elamur.ai/free/en/papers/manandhar-2010-semeval-2010-task-14-word/) — Suresh Manandhar, Ioannis Klapaftis, Dmitriy Dligach et al. · 2010 · 194 citations
- [Language Modelling Makes Sense: Propagating Representations through WordNet for Full-Coverage Word Sense Disambiguation](https://md.research.elamur.ai/free/en/papers/loureiro-2019-language-modelling-makes-sense-propagating/) — Daniel Loureiro, Alípio Jorge · 2019 · 189 citations
- [Entity Linking meets Word Sense Disambiguation: a Unified Approach](https://md.research.elamur.ai/free/en/papers/moro-2014-entity-linking-meets-word-sense/) — Andrea Moro, Alessandro Raganato, Roberto Navigli · 2014 · 188 citations
- [Word Sense Induction for Novel Sense Detection](https://md.research.elamur.ai/free/en/papers/lau-2012-word-sense-induction-novel-sense/) — Jey Han Lau, Paul Cook, Diana McCarthy et al. · 2012 · 187 citations
- [Improving Word Sense Disambiguation in Neural Machine Translation with Sense Embeddings](https://md.research.elamur.ai/free/en/papers/gonzales-2017-improving-word-sense-disambiguation-neural/) — Annette Rios Gonzales, Laura Mascarell, Rico Sennrich · 2017 · 185 citations
- [Clustering and Diversifying Web Search Results with Graph-Based Word Sense Induction](https://md.research.elamur.ai/free/en/papers/marco-2013-clustering-diversifying-web-search-results/) — Antonio Di Marco, Roberto Navigli · 2013 · 184 citations
- [An Enhanced Lesk Word Sense Disambiguation Algorithm through a Distributional Semantic Model](https://md.research.elamur.ai/free/en/papers/basile-2014-enhanced-lesk-word-sense-disambiguation/) — Pierpaolo Basile, Annalina Caputo, Giovanni Semeraro · 2014 · 174 citations
- [Graph Connectivity Measures for Unsupervised Word Sense Disambiguation](https://md.research.elamur.ai/free/en/papers/navigli-2007-graph-connectivity-measures-unsupervised-word/) — Roberto Navigli, Mirella Lapata · 2007 · 168 citations
- [A Perspective on Word Sense Disambiguation Methods and Their Evaluation](https://md.research.elamur.ai/free/en/papers/resnik-1997-perspective-word-sense-disambiguation-methods/) — Philip Resnik, David Yarowsky · 1997 · 151 citations

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