Antonyms, from the Greek anti ("opposite") and onoma ("name") are word pairs that are opposite in meaning, such as hot and cold, obese and skinny, and up and down. Words may have different antonyms, depending on the meaning. Both long and tall are antonyms of short. Antonyms are of three types:
Although the word antonym was only coined by philologists in the 19th century, such relationships are a fundamental part of a language, in contrast to synonyms, which are a result of history and drawing of fine distinctions, or homonyms, which are mostly etymological accidents or coincidences.
A few words with two antonymous meanings may also be designated contronyms:
Languages often have ways of creating antonyms as an easy extension of lexicon. An example is the English prefixes in- and un-. Unreal is the antonym of real and indocile is of docile.
Some planned languages abundantly use such devices to reduce vocabulary multiplication. Esperanto has mal- (compare bona = "good" and malbona = "bad"), Damin has kuri- (tjitjuu "small", kuritjitjuu "large") and Newspeak has un- (as in ungood, "bad").
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