A contronym is a word with two opposite meanings. For example, the word clip can mean "attach", as in paperclip, or "cut off", as in "clip the hedges". Since a contronym has at least two meanings, it is by definition polysemic.
The word combines the prefix contr(a)- (from the Latin contrā) and the suffix -onym (from international scientific vocabulary).
It was coined in 1962 by Jack Herring. The vowel of a suffix generally supersedes the vowel of a prefix, hence it being written as contronym instead of contranym.
A contronym is alternatively called an autantonym, autoantonymy, auto-antonym, antagonym, antilogy, contranym, enantiodrome (enantio- means "opposite"), enantionym, enantioseme, Janus word (after the Roman god Janus, who is usually depicted with two faces), or self-antonym.
Denotations and connotations of words can drift or branch over centuries. An apocryphal story relates how Charles II (or sometimes Queen Anne) described St Paul's Cathedral (using contemporaneous English) as "amusing, awful, and artificial", with the meaning (rendered in modern English) of "amazing, awe-inspiring, and artistic".
Seeming contronyms can arise from translation. In Hawaiian, for example, aloha is translated both as "hello" and as "goodbye", but the essential meaning of the word is "love", whether used as a greeting or farewell. Similarly, 안녕 (annyeong) in Korean and שלום (shalom) in Hebrew can mean both "hello" and "goodbye" but the central meaning is "peace". The Italian greeting ciao is translated as "hello" or "goodbye" depending on the context; the original meaning was "at your service" (literally "(I'm your) slave"). In Hungarian, "szervusz" serves a similar double role.
The coexistence of two opposite meanings in a word is called enantiosemy, and the examples are rather numerous.
to ... EFFECT
to ... EFFECT
entangle...disentangle, unravel
14. tr. Impartir una lección, pronunciar una conferencia o charla. 15. tr. Recibir una clase. Ayer dimos clase de matemáticas. 16. tr. Dicho de un alumno: Recitar la lección.
I. (sens subjectif) Être avisé, informé de (qqch.). II. (sens objectif) 2. Donner la connaissance, le savoir, la pratique de (qqch.).
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