Emily Dickinson Lexicon

O-MIS'SION, n. [Fr. from L. omissio, from omitto, omissus.]

1. Neglect or failure to do something which a person had power to do, or which duty required to be done. Omission may be innocent or criminal; innocent, when no duty demands performance; but criminal when duty is neglected. The most natural division of all offenses, is into those of omission and those of commission. Addison.
2. A leaving out; neglect or failure to insert or mention; as, the omission of a word or clause.