English Reference
noun

omission

n.
US /oʊˈmɪʃən/ UK /əʊmˈɪʃən/ omis·sion UK spelling omission's, omission's

  1. 01 B2 Upper Intermediate

    the act of not including something, or the thing that is missing.

    the act of excluding or failing to include something; also, the specific item or detail that has been left out.

    Simple

    The editor noticed the omission of a key name from the guest list.

    In context

    The report was criticized for its glaring omission of the environmental impact data, which many felt was a deliberate attempt to mislead the public.

    Usage

    Often used with the preposition 'of' to indicate what is missing.

  2. 02 C1 Advanced FormalTechnical Law

    a failure to do something that you were supposed to do.

    the neglect or failure to perform an action that one is legally or morally obligated to do.

    Simple

    The company was sued for its omission in providing safety equipment.

    In context

    Legal experts argued whether the accident was caused by a direct action or a negligent omission by the site supervisor.

    Usage

    Commonly paired with 'commission' in the phrase 'sins of commission and omission'.

  3. 03 C2 Proficiency TechnicalAcademic

    leaving out a letter or sound in a word, often shown by an apostrophe.

    the deletion of a letter or sound from a word or phrase, typically represented by an apostrophe in writing.

    Simple

    In the word 'don't', the apostrophe shows the omission of the letter 'o'.

    In context

    The poet used the omission of final consonants to mimic the specific regional dialect of the characters.

    Usage

    Used primarily in linguistics and grammar contexts.

    elisioncontraction

De Zerbi described Richarlison’s omission as a “consequence” of the Brazilian’s actions over the past month and a half.

The Guardian· 11 Sept 2026

From Middle English omissioun, from Old French omission, from Late Latin omissio, omissionem, from Latin omitto.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin omitto
Level B2 · Upper Intermediate
Frequency Frequent
Updated