From The Collaborative International Dictionary of English v.0.48:

Omission \O*mis"sion\, n. [L. omissio: cf. F. omission. See
   1. The act of omitting; neglect or failure to do something
      required by propriety or duty.
      [1913 Webster]

            The most natural division of all offenses is into
            those of omission and those of commission.
      [1913 Webster]

   2. That which is omitted or is left undone.
      [1913 Webster]
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