Lexical semantics

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Polysemy ( or ; ) is the capacity for a sign (e.g. a symbol, morpheme, word, or phrase) to have multiple related meanings. For example, a word can have several word senses. Polysemy is the opposite of monosemy, which denotes a word with a single meaning.

problem of natural language processing; identifying which sense of a word (has multiple meanings) is used in a sentence

subfield of linguistic semantics

one of the meanings of a word

basic unit of a language’s lexicon

Monosemy means 'one-meaning' and is a methodology primarily for lexical semantic analysis, but which has widespread applicability throughout the various strata of language.