in-validate

invalidate

[in-val-i-deyt]
verb (used with object), invalidated, invalidating.
1.
to render invalid; discredit.
2.
to deprive of legal force or efficacy; nullify.

Origin:
1640–50; invalid2 + -ate1

invalidation, noun
invalidator, noun


1. weaken, impair; disprove, refute, rebut.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
invalidate (ɪnˈvælɪˌdeɪt)
 
vb
1.  to render weak or ineffective, as an argument
2.  to take away the legal force or effectiveness of; annul, as a contract
 
invali'dation
 
n
 
in'validator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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