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Adverb: one by one
  1. In succession
    "the prisoners came out one by one";
    - one at a time
  2. One piece at a time
    "she sold the plates one by one";
    - by the piece
  3. Apart from others
    "taken one by one, the rooms were, in fact, square";
    - individually, separately, singly, severally, on an individual basis

Encyclopedia: One by one