emergency

IPA: ɪmˈɝdʒʌnsi

A situation which poses an immediate risk and which requires urgent attention.
The department of a hospital that treats emergencies.
An individual brought in at short notice to replace a member of staff, a player in a sporting team, etc.
(attributive) Arising from or used in an emergency.
(archaic) The quality of being emergent; sudden or unexpected appearance; an unforeseen occurrence.
(historical, Ireland) World War II as experienced in Ireland.

Examples of "emergency" in Sentences

Despite the prevalent use of the term emergency cesarean, this surgery is fairly rare.
DOD emergency functions include: _damage survey_, _search and rescue_, _emergency medical care_,
"The term 'emergency' is being used in a fast and loose fashion to cover yet more indecisive murmurings around the Greek bailout," he added in emailed comments.
In Smiley's case, there was mix-up in terminology: An FAA air traffic manager reported to the Air Force that he had a signal from an emergency beacon; the Air Force uses the term emergency transponder.