The act or instance of being defeated, of being overcome or vanquished; a loss.

The act or instance of defeating, of overcoming, vanquishing.

(law) Frustration (by prevention of success), stymieing; nullification.

(transitive) To overcome in battle or contest.

(transitive) To reduce, to nothing, the strength of.

(transitive) To nullify

To prevent (something) from being achieved.