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English definition of “omission”

omission

noun [C or U] uk   /əʊˈmɪʃ.ən/ /əˈ-/ us    /oʊ-/
the act of not including something or someone that should have been included, or something or someone that has not been included that should have been: Measures to control child employment are a glaring (= very obvious) omission from new legislation to protect children. There are some serious errors and omissions in the book. Many of the fans believe that the omission of Heacock from the team cost England the match.
(Definition of omission from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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