verb (used with object), validated, validating.
to make valid; substantiate; confirm: Time validated our suspicions.
to give legal force to; legalize.
to give official sanction, confirmation, or approval to, as elected officials, election procedures, documents, etc.: to validate a passport.

1640–50; < Medieval Latin validātus (past participle of validāre to make valid), equivalent to valid- (see valid) + -ātus -ate1

validation, noun
validator, noun
validatory [val-i-duh-tawr-ee, -tohr-ee] , adjective
nonvalidation, noun
revalidate, verb (used with object), revalidated, revalidating.
revalidation, noun
unvalidated, adjective
unvalidating, adjective

1. authenticate, verify, prove.

1. disprove. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
validate (ˈvælɪˌdeɪt)
1.  to confirm or corroborate
2.  to give legal force or official confirmation to; declare legally valid

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s, from L. validatus, from validus (see valid). Related: Validated.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Many people who had bought cars illegally are scrambling to validate the trade.
The public looks to the nation's past to validate its core ideals and affirm a
  record of progress and accomplishment.
Claims that run against the profession's previous findings are subject to more
  scrutiny than those that validate them.
Buy tickets at any station and validate before boarding.
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