polysemy

noun

1. (uncountable, usually)The quality characteristic of a polyseme, a sign (such as a word or symbol) that has multiple meanings (senses), often including multiple similar ones.

   “Fifty years ago the linguist and semanticist Stephen Ullmann wrote that polysemy, the fact that some words have a network of multiple but related meanings, is "the pivot of semantic analysis" […]”

   “Polysemy proliferates in natural language: Virtually every word is polysemous to some extent.”