conversational implicature See IMPLICATURE. converse. (1) Narrowly, the result of the immediate logical operation called conversion on any categorical proposition, accomplished by interchanging the subject term and the predicate term of that proposition. Thus, the converse of the categorical proposition ‘All cats are felines’ is ‘All felines are cats’. (2) More broadly, the proposition obtained from a given ‘i. . . the. . .’ (conditional) proposition by interchanging the antecedent and the consequent clauses, i.e., the propositions following the ‘if’ and the ‘then’, respectively; also, the argument obtained from an argument of the form ‘P; therefore Q’ by interchanging the premise and the conclusion. See also RELATION. R.W.B.