v. [ad. L. contrāpōnĕre to place against or opposite.] Logic. To convert by contraposition.
1864. Bowen, Logic, vi. 159. Logicians seem to have overlooked the fact that E can be contraponed into I. Ibid., vii. 212. The last … example, which is now the Modus Tollens, becomes the following, if we contrapone the Sumption.
