Noah Webster
Omission
OMIS'SION, noun [Latin 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.
2. A leaving out; neglect or failure; to insert or mention; as the omission of a word or clause.