Definition of confirm verb from the Oxford Advanced American Dictionary

        

    confirm

     verb
    verb
    NAmE//kənˈfərm//
     
    Verb Forms present simple I / you / we / they confirm
     
    he / she / it confirms
     
    past simple confirmed
     
    -ing form confirming
     
     
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  1. 1to state or show that something is definitely true or correct, especially by providing evidence confirm something Rumors of job losses were later confirmed. His guilty expression confirmed my suspicions. Please write to confirm your reservation (= say that it is definite). confirm (that)… Has everyone confirmed (that) they're coming? confirm what/when, etc… Can you confirm what happened? it is confirmed that… It has been confirmed that the meeting will take place next week.
  2. 2confirm something confirm somebody (in something) to make someone feel or believe something even more strongly The walk in the mountains confirmed his fear of heights.
  3. 3confirm something to make a position, an agreement, etc. more definite or official; to establish someone or something firmly After a six-month probationary period, her position was confirmed. He was confirmed as captain for the rest of the season.
  4. 4[usually passive] confirm somebody to make someone a full member of the Christian Church She was baptized when she was a month old and confirmed when she was thirteen.
  5. 5[usually passive] confirm somebody to perform a ceremony when a young person has completed their high school Jewish studies
See the Oxford Advanced Learner's Dictionary entry: confirm