1. a sudden unforeseen crisis (usually involving danger) that requires immediate action

- he never knew what to do in an emergency

Similar word(s): exigency, pinch

Definition categories: event, crisis

2. a state in which martial law applies

- the governor declared a state of emergency

Definition categories: state

3. a brake operated by hand; usually operates by mechanical linkage

Definition categories: man–made, brake

Sentences with emergency as a noun:

- Cardiac arrest is an emergency and if you find someone in cardiac arrest you should call 999 immediately.