biconditional

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noun bi·con·di·tion·al \ˌbī-kən-ˈdish-nəl, -ˈdi-shə-\

Definition of biconditional

  1. :  a relation between two propositions that is true only when both propositions are simultaneously true or false — see truth table table

1940

First Known Use of biconditional

1940


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