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[kuh n-furm] /kənˈfɜrm/
verb (used with object)
to establish the truth, accuracy, validity, or genuineness of; corroborate; verify:
This report confirms my suspicions.
to acknowledge with definite assurance:
Did the hotel confirm our room reservation?
to make valid or binding by some formal or legal act; sanction; ratify:
to confirm a treaty; to confirm her appointment to the Supreme Court.
to make firm or more firm; add strength to; settle or establish firmly:
Their support confirmed my determination to run for mayor.
to strengthen (a person) in habit, resolution, opinion, etc.:
The accident confirmed him in his fear of driving.
to administer the religious rite of confirmation to.
Origin of confirm
1250-1300; < Latin confirmāre to strengthen, confirm (see con-, firm1); replacing Middle English confermen < Old French < Latin, as above
Related forms
confirmable, adjective
confirmability, noun
confirmer; Law. confirmor
[kon-fer-mawr, kuh n-fur-mer] /ˌkɒn fərˈmɔr, kənˈfɜr mər/ (Show IPA),
confirmingly, adverb
nonconfirming, adjective
preconfirm, verb (used with object)
reconfirm, verb (used with object)
unconfirm, verb (used with object)
unconfirmability, noun
1. prove, substantiate, authenticate, validate. 4. fix.
1. disprove. 3. invalidate. 4. shake. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for confirm
  • They will then perform an ultrasound to confirm the pregnancy.
  • Absolutely, but in order to confirm their existence, particularly strong evidence is required.
  • What they won't confirm is what they will be selling and for how much.
  • In this case, the observations confirm that the rate of expansion has actually decreased.
  • Within a year bigger detectors will turn on, and they may yet confirm the present hints to be real signals.
  • Scientists say more research is needed to confirm the hypothesis that dirt has health benefits.
  • They should confirm their study site by contacting the project's coordinators.
  • However, the outcrops were small and more detailed observations were required to confirm their presence.
  • To attempt to harmonize them in an impossible unity is only to confirm them in their several peculiarities.
  • These relations are incontestable, and there are other considerations which still further confirm them.
British Dictionary definitions for confirm


verb (transitive)
(may take a clause as object) to prove to be true or valid; corroborate; verify
(may take a clause as object) to assert for a second or further time, so as to make more definite: he confirmed that he would appear in court
to strengthen or make more firm: his story confirmed my doubts
to make valid by a formal act or agreement; ratify
to administer the rite of confirmation to
Derived Forms
confirmable, adjective
confirmatory, confirmative, adjective
confirmer, noun
Word Origin
C13: from Old French confermer, from Latin confirmāre, from firmusfirm1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for confirm

mid-13c., confirmyn "to ratify," from Old French confermer (13c., Modern French confirmer) "strengthen, establish, consolidate; affirm by proof or evidence; anoint (a king)," from Latin confirmare "make firm, strengthen, establish," from com-, intensive prefix (see com-), + firmare "to strengthen," from firmus (see firm (adj.)). Related: Confirmative; confirmatory.

Online Etymology Dictionary, © 2010 Douglas Harper
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