Etymology
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hostility (n.)

early 15c., hostilite, "hostile action," from Old French hostilité "enmity" (15c.), or directly from Late Latin hostilitatem (nominative hostilitas) "enmity," from Latin hostilis "inimical," from hostis, in earlier use "a stranger, foreigner," in classical use "an enemy," from PIE root *ghos-ti- "stranger, guest, host." Hostilities in the sense of "warfare" attested from 1610s.

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Definitions of hostility

hostility (n.)
a hostile (very unfriendly) disposition;
he could not conceal his hostility
Synonyms: ill will
hostility (n.)
a state of deep-seated ill-will;
Synonyms: enmity / antagonism
hostility (n.)
the feeling of a hostile person;
he could no longer contain his hostility
Synonyms: enmity / ill will
hostility (n.)
violent action that is hostile and usually unprovoked;
Synonyms: aggression
From wordnet.princeton.edu