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contraposition


Definition of contraposition

noun

[mass noun] Logic
  • conversion of a proposition from all A is B to all not-B is not-A.

Derivatives

contrapositive

Pronunciation: /-ˈpɒzɪtɪv/

adjective & noun

Origin:

mid 16th century: from late Latin contrapositio(n-), from the verb contraponere, from contra- 'against' + ponere 'to place'

contraposition in other Oxford dictionaries

Definition of contraposition in the US English dictionary