"omission" in the noun sense
1. omission, skip
a mistake resulting from neglect
2. omission
something that has been omitted
"she searched the table for omissions"
3. omission, deletion
any process whereby sounds or words are left out of spoken words or phrases
4. omission
neglecting to do something leaving out or passing over something
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License