verb con·firm \ kən-ˈfərm \
|Updated on: 13 Aug 2018

Definition of confirm

confirmed; confirming; confirms
1 : to give approval to : ratify
  • confirm a treaty
2 : to make firm or firmer : strengthen
  • confirm one's resolve
3 : to administer the rite of confirmation to
4 : to give new assurance of the validity of : remove doubt about by authoritative act or indisputable fact
  • confirm a rumor
  • confirm an order


play \kən-ˌfər-mə-ˈbi-lə-tē\ noun


play \kən-ˈfər-mə-bəl\ adjective

Examples of confirm in a Sentence

  1. The tests confirmed the doctors' suspicions of cancer.

  2. The attack confirmed her worst fears about the neighborhood.

  3. The award confirmed her status as one of the great movie actresses.

  4. The dentist's office called to confirm your appointment for tomorrow.

  5. We have a reservation for you for tomorrow night. Please call to confirm.

Recent Examples of confirm from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'confirm.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of confirm

Middle English, from Anglo-French cunfermer, from Latin confirmare, from com- + firmare to make firm, from firmus firm

Synonym Discussion of confirm

confirm, corroborate, substantiate, verify, authenticate, validate mean to attest to the truth or validity of something. confirm implies the removing of doubts by an authoritative statement or indisputable fact.
    • confirmed the reports
corroborate suggests the strengthening of what is already partly established.
    • witnesses corroborated his story
substantiate implies the offering of evidence that sustains the contention.
    • the claims have yet to be substantiated
verify implies the establishing of correspondence of actual facts or details with those proposed or guessed at.
    • all statements of fact in the article have been verified
authenticate implies establishing genuineness by adducing legal or official documents or expert opinion.
    • handwriting experts authenticated the diaries
validate implies establishing validity by authoritative affirmation or by factual proof.
    • validated the hypothesis by experiments

CONFIRM Defined for English Language Learners


Definition of confirm for English Language Learners

  • : to state or show that (something) is true or correct

  • : to tell someone that something has definitely happened or is going to happen : to make (something) definite or official

  • : to make (something) stronger or more certain : to cause (someone) to believe (something) more strongly

CONFIRM Defined for Kids


verb con·firm \ kən-ˈfərm \

Definition of confirm for Students

confirmed; confirming
1 : to make sure of the truth of
  • Their arrest confirms my suspicion.
2 : to make firm or firmer (as in a habit, in faith, or in intention) : strengthen
  • The job at the shelter confirmed her intention to become a veterinarian.
3 : approve 2, accept
  • Senators confirmed the treaty.
4 : to perform a ceremony admitting a person into a church or synagogue

Law Dictionary


transitive verb con·firm

legal Definition of confirm

1 a : to make valid by necessary formal approval
  • the debtor's chapter 13 plan confirmed by the court
b : to vote approval of
  • confirm a nomination
2 : to give formal acknowledgment of receipt of
3 : to remove doubt about by authoritative act or indisputable fact
  • a consent decree confirming Capt. Brown's right to his cargo
  • —W. G. Young

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very hard to disturb or upset

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