verb con·firm \kən-ˈfərm\

Definition of confirm

  1. transitive verb
  2. 1 :  to give approval to :  ratify confirm a treaty

  3. 2 :  to make firm or firmer :  strengthen confirm one's resolve

  4. 3 :  to administer the rite of confirmation to

  5. 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.

Origin and Etymology of confirm

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

First Known Use: 13th century

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


verb con·firm \kən-ˈfərm\

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




  1. 1 :  to make sure of the truth of Their arrest confirms my suspicion.

  2. 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. 3 :  approve 2, accept Senators confirmed the treaty.

  4. 4 :  to perform a ceremony admitting a person into a church or synagogue

Law Dictionary


transitive verb con·firm

Legal Definition of confirm

  1. 1a :  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. 2 :  to give formal acknowledgment of receipt of

  3. 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

Seen and Heard

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to cast off or become cast off

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