Definitions for "Polysemy"
a term applied to words that have more than one related meaning; multiple meaning. Note: The term is used only to refer to the variant meanings of one base word or dictionary entry, as run; it does not apply to all meanings of homonyms such as mood (feeling) and mood (verb form).
Existence of many meanings e.g., do up your fly, there's a fly in my soup, I will to London.
the ambiguity of an individual word or phrase that can be used (in different contexts) to express two or more different meanings