verb (used with object), certified, certifying.
to attest as certain; give reliable information of; confirm: He certified the truth of his claim.
to testify to or vouch for in writing: The medical examiner will certify his findings to the court.
to guarantee; endorse reliably: to certify a document with an official seal.
to guarantee (a check) by writing on its face that the account against which it is drawn has sufficient funds to pay it.
to award a certificate to (a person) attesting to the completion of a course of study or the passing of a qualifying examination.
to declare legally insane and committable to a mental institution.
Archaic. to assure or inform with certainty.
verb (used without object), certified, certifying.
to give assurance; testify; vouch for the validity of something (usually followed by to ).

1300–50; Middle English certifien < Middle French certifier < Late Latin certificāre, equivalent to Latin certi- (combining form of certus decided; see certain) + -ficāre -fy

certifier, noun
precertify, verb (used with object), precertified, precertifying.
recertify, verb (used with object), recertified, recertifying.
uncertifying, adjective

1. corroborate, verify, validate, guarantee. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To precertifying
World English Dictionary
certify (ˈsɜːtɪˌfaɪ)
vb , -fies, -fying, -fied
1.  to confirm or attest (to), usually in writing: the letter certified her age
2.  (tr) to endorse or guarantee (that certain required standards have been met)
3.  to give reliable information or assurances: he certified that it was Walter's handwriting
4.  (tr) to declare legally insane
5.  (US), (Canadian) (tr) (of a bank) to state in writing on (a cheque) that payment is guaranteed
[C14: from Old French certifier, from Medieval Latin certificāre to make certain, from Latin certuscertain + facere to make]

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

early 14c., from O.Fr. certifier "make certain," from L.L. certificare, from L. certus (see certain) + root of facere "to make, do" (see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper
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