Definition - A word that has multiple meanings.

Example -
The OED has 30 different definitions for the noun sign.

Etymology -
The word derives from the Greek poly, many + sema, sign.

Oxford English Dictionary -
Its first citation is from 1953:
"Identifications of this type are … most convincing when parallel translation-pairs are found as homonyms within a single language, which one would then wish to consider as polysemes."
(Trans. Philol. Soc. 60)

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