— invalidation , n. — invalidator , n.
/in val"i dayt'/ , v.t., invalidated, invalidating .
1. to render invalid; discredit.
2. to deprive of legal force or efficacy; nullify.
[ 1640-50; INVALID 2 + -ATE 1 ]
Syn. 1. weaken, impair; disprove, refute, rebut.