Etymology
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animosity (n.)

early 15c., "vigor, bravery" (a sense now obsolete), from Old French animosité (14c.) or directly from Latin animositatem (nominative animositas) "boldness, vehemence," from animosus "bold, spirited," from animus "life, breath" (from PIE root *ane- "to breathe"). Sense of "active hostile feeling" is from c. 1600, from a secondary sense in Latin.

updated on September 22, 2022

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Definitions of animosity from WordNet

animosity (n.)
a feeling of ill will arousing active hostility;
Synonyms: animus / bad blood
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.