A word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other:
— To him the antonym of `gay' was `depressed'.

synonyms: opposite, opposite word.

Roget 237: contraposition^†, opposition; polarity; inversion etc. 218; opposite side; reverse, inverse; counterpart; antipodes; opposite poles, North and South.    antonym, opposite (contrariety) 14.    ... show more

Roget 564: nomenclature; naming etc. v.; nuncupation^†, nomination, baptism; orismology^†; onomatopoeia; antonomasia^†.    name; appelation^†, appelative^†; designation, title; heading, rubric; caption; denomination; by-name, epithet.    style, proper name; praenomen [Lat.], agnomen^†, cognomen; patronymic, surname; cognomination^†; eponym; compellation^†, description, antonym; empty title, empty name; handle to one's name; namesake.    term, expression, noun; byword; convertible terms etc. 522; technical term; cant etc. 563.    ... show more

Dutch: tegendeel, tegengestelde, tegenovergestelde, antoniem
Polish: antonim