(1):
(a.) Affirming the contrary; implying a denial of what has been asserted; also, mutually contradicting; inconsistent.
(2):
(a.) Opposing or opposed; repugnant.
(3):
(n.) A proposition or thing which denies or opposes another; contrariety.
(4):
(n.) propositions with the same terms, but opposed to each other both in quality and quantity.