Antonym Definition

ăntə-nĭm
antonyms
noun
antonyms
A word having a meaning opposite to that of another word.
The word “wet” is an antonym of the word “dry.”
American Heritage
A word that is opposite in meaning to another word.
“sad” is an antonym of “happy”
Webster's New World

(semantics) A word which has the opposite meaning of another, although not necessarily in all its senses.

"rich" is an antonym of "poor"; "full" is an antonym of "empty".
Wiktionary
Antonyms:

Other Word Forms of Antonym

Noun

Singular:
antonym
Plural:
antonyms

Origin of Antonym

  • circa 1870: ant- +‎ -onym

    From Wiktionary

  • ant(i)– –onym

    From American Heritage Dictionary of the English Language, 5th Edition

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antonym