omis·sion /oˈmɪʃən, ə-/
 省略,遺漏,疏忽


 O·mis·sion n.
 1. The act of omitting; neglect or failure to do something required by propriety or duty.
    The most natural division of all offenses is into those of omission and those of commission.   --Addison.
 2. That which is omitted or is left undone.

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 omission
      n 1: a mistake resulting from neglect [syn: skip]
      2: something that has been omitted; "she searched the table for
         omissions"
      3: any process whereby sounds are left out of spoken words or
         phrases [syn: deletion]
      4: neglecting to do something; leaving out or passing over
         something