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From The Collaborative International Dictionary of English v.0.48:
Omission \O*mis"sion\, n. [L. omissio: cf. F. omission. See Omit.] 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. --Addison. [1913 Webster] 2. That which is omitted or is left undone. [1913 Webster]