1. A plaque, medal, or other award given in acknowledgment of a victory, success, or some other achievement; especially, in a sporting contest.
2. A memento that symbolizes victory or success; for example, the head of an animal killed during a hunting expedition or something taken from an enemy killed in battle.
3. Something that symbolizes a personal victory or achievement.
4. In ancient Greece or Rome, a victory memorial in a public place or near a battlefield, originally a display of enemy weapons.
5. A representation of a Greek or Roman battle trophy; such as, on a commemorative medal, plaque, or monument.
6. A decorative casting or carving showing weapons or armor on a square or circular base.
7. Etymology: a trophy is something awarded to commemorate an enemy's "turning round" and running away.

From French trophee and Latin trophaeum from Greek tropaion, "monument to the enemy's defeat".