Definition - Using a word in a sense opposite to its expected meaning.

Example -
He was an honest crimminal.

Etymology -
The word derives from the Greek antiphrazein, to express by saying the opposite (from anti, opposite + phrasis, speech).

Oxford English Dictionary -
Its first citation is from 1533:
"The fygure of ironye or antiphrasis."
(More Debell. Salem v. Wks. 1557, 939/1)

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