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The Collaborative International Dictionary
Homonymy

Homonymy \Ho*mon"y*my\, n. [Gr. ?: cf. F. homonymie.]

  1. Sameness of name or designation; identity in relations.
    --Holland.

    Homonymy may be as well in place as in persons.
    --Fuller.

  2. Sameness of name or designation of things or persons which are different; ambiguity.

Wiktionary
homonymy

n. (context semantics English) The property of being a homonym.