any word that can be its own antonym, e.g. cleave, overlook; also called antilogy , autoantonym , contronym , enantiodrome , [Janus word]
Handicap is a good example of a contranym.
[kon-truh-ok-tiv, -teyv] /ˌkɒn trəˈɒk tɪv, -teɪv/ noun, Music. 1. the octave between the second and third C’s below middle C.
[koun-ter-pahr-tee] /ˈkaʊn tərˌpɑr ti/ noun, plural counterparties. Finance. 1. the other person or institution entering into a financial contract or transaction: the default of a counterparty. /ˈkaʊntəˌpɑːtɪ/ noun (pl) -parties 1. a person who is a party to a contract
[kon-truh-awr-bi-tl] /ˌkɒn trəˈɔr bɪ tl/ adjective 1. of or relating to flight in the orbit of, but in a direction contrary to, a given rocket, ballistic missile, satellite, etc.
[kon-truh-pohz] /ˈkɒn trəˌpoʊz/ verb (used with object), contraposed, contraposing. 1. to place in contraposition.