–noun 1. exceptional valor, bravery, or ability, esp. in combat or battle.

2. exceptional or superior ability, skill, or strength: his prowess as a public speaker.

3. a valiant or daring deed.

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Origin:

1250–1300; ME < OF proesse, proece goodness, bravery, equiv. to prou prow 2 + -esse < L -itia -ice