Definition of alter verb from the Oxford Advanced American Dictionary

        

    alter

     verb
    verb
    NAmE//ˈɔltər//
     
    Verb Forms present simple I / you / we / they alter
     
    he / she / it alters
     
    past simple altered
     
    -ing form altering
     
     
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  1. 1 [intransitive, transitive] to become different; to make someone or something different Prices did not alter significantly during 2010. He had altered his looks so much I barely recognized him. alter somebody/something It doesn't alter the way I feel. Nothing can alter the fact that we are to blame. The landscape has been radically altered, severely damaging wildlife. This incident altered the whole course of events.
  2. 2[transitive] alter something to make changes to a piece of clothing so that it will fit you better We can have the dress altered to fit you.
 
adjective (formal)
See the Oxford Advanced Learner's Dictionary entry: alter