Nullify

nul′i-fī, v.t. to make null: to annul: to render void or of no force:— pr.p. null′ifying; pa.t. and pa.p. null′ified. — ns. Nullificā′tion , a rendering void or of none effect, esp. ( U.S. ) of a contract by one of the parties, or of a law by one legislature which has been pa ed by another; Null′ifier ; Null′ity , the state of being null or void: nothingne : want of existence, force, or efficacy.