From Longman Dictionary of Contemporary Englishomissiono‧mis‧sion /əʊˈmɪʃən, ə- $ oʊ-, ə-/ ●○○ noun 1 [uncountable]NOT DO something when you do not include or do not do somethingomission of The omission of her name was not a deliberate act.omission from his omission from the team2 [countable]INCLUDE something that has been omitted Copies of the lists were posted so that omissions could be corrected.serious/notable/major omission Your failing to note her mistakes is a serious omission.a glaring omission (=one that is very bad and easily noticed)
Examples from the Corpus
omission• In spite of variations, distortions, and omissions, humans are good at retrieving the correct pattern.• Brazenly, Rumsfeld ignored the question, but it was an eloquent omission.• In fact, his list of credits is so extensive, it is understandable that an employer might overlook one glaring omission.• Its only major omission was a failure to spot the Starship virus.• There are two types of crime which will not suffice as the unlawful act: crimes of negligence and crimes of omission.• Copies of the census lists were posted so omissions could be pointed out.• There is however, one strange omission.• But the omission was, none the less, a serious one.• The omission of a warning on the product's label was the result of a printing error.a glaring omission• It's not a glaring omission, but an odd one, you have to admit. 