Definition of alteration noun from the Oxford Advanced Learner's Dictionary

      

    alteration

     noun
    noun
    BrE BrE//ˌɔːltəˈreɪʃn//
     
    ; NAmE NAmE//ˌɔːltəˈreɪʃn//
     
     
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  1. 1[countable] a change to something that makes it different major/minor alterations alteration to something They are making some alterations to the house. alteration in something an alteration in the baby’s heartbeat
  2. 2[uncountable] the act of making a change to something The dress will not need much alteration.
  3. Word Origin late Middle English: from Old French, or from late Latin alteratio(n-), from the verb alterare, from Latin alter ‘other’.Extra examples There will be no alteration in corporation tax. There will be no alteration in the level of subsidy. We will have to make a slight alteration to the plans. They are making some major alterations to the house.
See the Oxford Advanced American Dictionary entry: alteration