Definition of alter verb from the Oxford Advanced Learner's Dictionary

        

    alter

     verb
    verb
    BrE BrE//ˈɔːltə(r)//
     
    ; NAmE NAmE//ˈɔːltər//
     
    Verb Forms present simple I / you / we / they alter
    BrE BrE//ˈɔːltə(r)//
     
    ; NAmE NAmE//ˈɔːltər//
     
    he / she / it alters
    BrE BrE//ˈɔːltəz//
     
    ; NAmE NAmE//ˈɔːltərz//
     
    past simple altered
    BrE BrE//ˈɔːltəd//
     
    ; NAmE NAmE//ˈɔːltərd//
     
    past participle altered
    BrE BrE//ˈɔːltəd//
     
    ; NAmE NAmE//ˈɔːltərd//
     
    -ing form altering
    BrE BrE//ˈɔːltərɪŋ//
     
    ; NAmE NAmE//ˈɔːltərɪŋ//
     
     
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  1. 1  [intransitive, transitive] to become different; to make somebody/something different Prices did not alter significantly during 2014. He had altered so much I scarcely 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.
  3. Word Origin late Middle English: from Old French alterer, from late Latin alterare, from Latin alter ‘other’.Extra examples Unemployment has come down slightly but this does not alter the fact that it is still a major problem. Fame hasn’t really changed/​altered him. It doesn’t alter the way I feel. Property prices did not significantly alter during 2007. Rick hasn’t changed/​altered much. The party’s policies have hardly altered, but public opinion has. They can alter the programme until success is achieved. This development will alter the character of the town. This law needs to be altered.
See the Oxford Advanced American Dictionary entry: alter