Definitions from Wiktionary (opposition)

▸ noun:  The action of opposing or of being in conflict.
▸ noun:  An opposite or contrasting position.
▸ noun:  (astronomy) The apparent relative position of two celestial bodies when one is at an angle of 180 degrees from the other as seen from the Earth.
▸ noun:  (politics) A political party or movement opposed to the party or government in power.
▸ noun:  (law) In United States intellectual property law, a proceeding in which an interested party seeks to prevent the registration of a trademark or patent.
▸ noun:  (chess) A position in which the player on the move must yield with his king allowing his opponent to advance with his own king.
▸ noun:  (logic) The difference of quantity or quality between two propositions having the same subject and predicate.

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