(1):

(v.) Frustration by rendering null and void, or by prevention of success; as, the defeat of a plan or design.

(2):

(v.) An undoing or annulling; destruction.

(3):

(v. t.) To render null and void, as a title; to frustrate, as hope; to deprive, as of an estate.

(4):

(v. t.) To overcome or vanquish, as an army; to check, disperse, or ruin by victory; to overthrow.

(5):

(v. t.) To resist with success; as, to defeat an assault.

(6):

(v.) An overthrow, as of an army in battle; loss of a battle; repulse suffered; discomfiture; - opposed to victory.

(7):

(v. t.) To undo; to disfigure; to destroy.