–noun 1. the capacity of a nation to destroy, by nuclear weapons, more of an enemy than would be necessary for a military victory.
2. an instance of such destruction.
3. an excess of what is required or suitable, as because of zeal or misjudgment.
–verb (used with object), -fied, -fy⋅ing. 1. to render or declare legally void or inoperative: to nullify a contract.
2. to deprive (something) of value or effectiveness; make futile or of no consequence.