Emergency Definition

ĭ-mûrjən-sē
emergencies
noun
emergencies
A sudden, generally unexpected occurrence or set of circumstances demanding immediate action.
Webster's New World
A condition of urgent need for action or assistance.
A state of emergency.
American Heritage

(Canada, US, often attributive) The department of a hospital that treats emergencies.

Wiktionary
Cardiac arrest is an emergency and if you find someone in cardiac arrest you should call 999 immediately.
Wiktionary
Antonyms:
adjective
For use in case of sudden necessity.
An emergency brake.
Webster's New World

Other Word Forms of Emergency

Noun

Singular:
emergency
Plural:
emergencies

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