Light and dark are antonyms.
The definition of antonyms are words that have contrasting meanings.
An example of antonyms are light and dark.
a word that is opposite in meaning to another word: “sad” is an antonym of “happy”
Origin of antonymwith altered sense (as if from anti-) from Classical Greek ant?nymia, a pronoun from anti-, equal to, instead of, opposite (see anti-) + onyma, name
A word having a meaning opposite to that of another word: The word “wet” is an antonym of the word “dry.”
Origin of antonymant(i)- -onym
- (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".
circa 1870: ant- + -onym