To overcome in battle or contest.
Wellington defeated Napoleon at Waterloo.
To reduce, to nothing, the strength of.
He finds himself naturally to dread a superior Being that can defeat all his designs, and disappoint all his hopes.
To nullify
The act or instance of being defeated, of being overcome or vanquished; a loss.
Licking their wounds after a temporary defeat, they planned their next move.
The act or instance of defeating, of overcoming, vanquishing.
From Middle English defeten, from Middle English defet (“disfigured”, past participle) and defet (“defect”, noun), see Etymology 2 below.
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The escheators […] defeated the right heir of his succession.
The inscription records her defeat of the country's enemies in a costly war.
Frustration (by prevention of success), stymieing; (law) nullification.
... is subsequently issued to him, in accordance with his perfect equity thus acquired, by a legal fiction which the law creates for the protection, but not for the defeat, of his title.