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Omission is a noun.
An omission is when something is left out.
The omission of his name from the movie credits is regrettable.
He lied by omission when he failed to say that he had in fact been there that night.
It was an omission to not give the winner a prize.
Lives of Omission was created in 2011.
elision is the omission of sounds, especially the omission of schwa.