Phrase guide

never event

noun · 3 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

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No pronunciation record was provided for this word.

1

noun

Meaning 1

A bad event that should never occur.

Definition source: English Wiktionary via Wiktextract

Examples

  • The safety systems engineer examined records of never events across several industries, including health care, air traffic control, and nuclear power.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: event, occurrence, happening

2

noun

Meaning 2

A bad event that should never occur.

A serious adverse medical event that should never occur and thus is, by strict definitions of preventability, always preventable, being unambiguous, clearly identifiable and measurable, and resulting in death or significant disability.

Definition source: English Wiktionary via Wiktextract

Examples

  • Wrong-site surgery is a never event because it is always preventable when adequate double checks and crosschecks are enforced.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: event, occurrence, happening

3

noun

Meaning 3

A bad event that should never occur.

A serious adverse medical event that should never occur and thus is, by strict definitions of preventability, always preventable, being unambiguous, clearly identifiable and measurable, and resulting in death or significant disability.

A particularly shocking preventable medical error that should never occur.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: event, occurrence, happening, error, mistake

History

Etymology

The strictest sense, referring to a particularly shocking medical error that should never happen, was the original sense of a never event (circa 2001), although a nuclear power industry publication from the 1980s mentioned a "once-in-a-never event", a collocation playing on such predecessors as once-in-a-blue-moon event and once-in-a-lifetime event.