in·val·i·date /(ˌ)ɪnˈvæləˌdet/
(vt.)使無效
In·val·i·date v. t. [imp. & p. p. Invalidated p. pr. & vb. n. Invalidating.] To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument.
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invalidate
v 1: declare invalid; "The contract was annulled"; "void a plea"
[syn: annul, quash, void, avoid, nullify]
[ant: validate]
2: of cheques or tickets [syn: cancel]
3: show to be invalid [syn: nullify] [ant: validate]
4: take away the legal force of or render ineffective;
"invalidateas a contract" [syn: void, vitiate] [ant: validate]