noun Linguistics.

the state or quality of being a hyponym, a term that denotes a subcategory of a more general class: A relationship of hyponymy exists between “dog” and “animal.”

Compare hypernymy.

Origin of hyponymy

1950–55; hyp- + -onymy (see -onym, -y3), on the model of homonymy, synonymy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019