[ an-tuh-nim ]
/ ˈæn tə nɪm /
a word opposite in meaning to another. Fast is an antonym of slow.Compare synonym(def 1).
Related formsan·ton·y·mous [an-ton-uh-muh s] /ænˈtɒn ə məs/, an·to·nym·ic, adjectivean·ton·y·my, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for antonym
By and by, which was once a synonym, has become an antonym of immediately, meaning at some (perhaps remote) future time.
In strict usage, daily is the antonym of nightly as diurnal is of nocturnal.
British Dictionary definitions for antonym
/ (ˈæntənɪm) /
a word that means the opposite of another word``empty'' is an antonym of ``full''
Derived Formsantonymous (ænˈtɒnɪməs), adjective
Word Origin for antonym
C19: from Greek antōnumia, from anti- + onoma name
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012