See antithesis in Webster's New World Roget's A-Z Thesaurus II
noun
The condition of being in conflict:
antagonism, contradiction, contradistinction, contraposition, contrariety, contrariness, opposition, polarity. See supportThat which is diametrically opposed to another:
antipode, antipodes, antonym, contrary, converse2, counter, opposite, reverse. (Logic) contradictory, contrapositive. See support
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