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invalidate
in·val·i·date [ in vállə dàyt ] (past and past participle in·val·i·dat·ed, present participle in·val·i·dat·ing, 3rd person present singular in·val·i·dates)


transitive verb 
Definition:
 
1. make not legal: to deprive something of its legal force or value, e.g. by failing to comply with some terms and conditions
2. show to be wrong: to prove that something is wrong or make something worthless

in·val·i·da·tion [ in vàllə dáysh'n ] noun

Word Key: Synonyms

See nullify.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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