antithesis

(ăn-tĭthˈĭ-sĭs)

1. Direct contrast; opposition.
2. The direct or exact opposite: Hope is the antithesis of despair.
3. a. A figure of speech in which sharply contrasting ideas are juxtaposed in a balanced or parallel phrase or grammatical structure, as in “Hee for God only, shee for God in him” (John Milton).
   b. The second and contrasting part of such a juxtaposition.
4. The second stage of the Hegelian dialectic process, representing the opposite of the thesis.