Etymology
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antiphrasis (n.)

in rhetoric, "the use of a word in a sense opposite to its proper meaning; ironic use of a word in sarcasm or humor," 1530s, from Latin antiphrasis, from Greek antiphrasis, from antiphrazein "to express (something) by the opposite," from anti "against, opposite, instead of" (see anti-) + phrazein "to tell, declare, point out, express" (see phrase (n.)). Related: Antiphrastic.

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Definitions of antiphrasis

antiphrasis (n.)
the use of a word in a sense opposite to its normal sense (especially in irony);
From wordnet.princeton.edu