Main Entry: con·tra·po·si·tion

Pronunciation: \-pə-ˈzi-shən\

Function: noun

Etymology: Late Latin contraposition-, contrapositio, from Latin contraponere to place opposite, from contra- + ponere to place — more at position

Date: 1551

: the relationship between two propositions when the subject and predicate of one are respectively the negation of the predicate and the negation of the subject of the other