| opposition | |
| 1. n. The action of opposing or of being in conflict. | |
| 2. n. An opposite or contrasting position. | |
| 3. n. (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. | |
| 4. n. (politics) A political party or movement opposed to the party or government in power. | |
| 5. n. (legal) In United States intellectual property law, a proceeding in which an interested party seeks to prevent the registration of a trademark or patent. | |
| 6. n. (chess) A position in which the player on the move must yield with his king allowing his opponent to advance with his own king. | |
| 7. n. (logic) The difference of quantity or quality between two propositions having the same subject and predicate. | |
