A word having a meaning opposite to that of another word.
The word “wet” is an antonym of the word “dry.”
A word that is opposite in meaning to another word.
“sad” is an antonym of “happy”
Webster's New World
The definition of antonyms are words that have contrasting meanings.
An example of antonyms are light and dark.
(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".
Other Word Forms of Antonym
Origin of Antonym
circa 1870: ant- + -onym
From American Heritage Dictionary of the English Language, 5th Edition
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Words Starting With A and Ending With M