• (British) IPA: /ɒl.tə(ɹ)ˈeɪ.ʃən/
  • (America) IPA: /ɔl.tɚˈeɪ.ʃən/


  1. The act of altering or making different.
  2. The state of being altered; a change made in the form or nature of a thing; changed condition.
    • 1892, Arthur Conan Doyle, The Resident Scholar in ''The Memoirs of Sherlock Holmes,
      …and I saw by the alteration in your face that a train of thought had been started.
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