noun · 9 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ə(ʊ)ˈmɪʃ.ən/
Canada, General-American:/oʊˈmɪʃ.ən/
Canada:Recorded audio is listed in the source snapshot.
General-American:Recorded audio is listed in the source snapshot.
rhymes with -ɪʃən
CMU ARPABET:OW0 M IH1 SH AH0 N
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
The act of omitting.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
The act of neglecting to perform an action one has an obligation to do.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
Examples
E&O insurance (for errors and omissions) covers both errors of commission and errors of omission.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
An instance of those acts, or the thing left out thereby; something deleted or left out.
Definition source: English Wiktionary via Wiktextract
Usage: countable
Examples
The suspicious omissions in the new edition of the book attracted claims of censorship.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
Something not done or neglected.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Examples
The lack of a sponge count was an omission by the surgical team.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
noun
Meaning 5
The shortening of a word or phrase, using an apostrophe ( ' ) to replace the missing letters, often used to approximate the sound of speech or a specific dialect.
Definition source: English Wiktionary via Wiktextract