from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Logic A proposition derived by negating and permuting the terms of another, equivalent proposition; for example, All not-Y is not-X is the contrapositive of All X is Y.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the inverse of the converse of a given proposition
from The Century Dictionary and Cyclopedia
- Of, pertaining to, or produced by contraposition: as, contrapositive propositions; contrapositive conversion.
- n. In logic, a contrapositive proposition.
Sorry, no etymologies found.