What is the meaning of Emergency?

A situation which poses an immediate risk and which requires urgent attention.

The department of a hospital that treats emergencies.

A person brought in at short notice to replace a member of staff, a player in a sporting team, etc.

Arising from or used in an emergency.

The quality of being emergent; sudden or unexpected appearance; an unforeseen occurrence.

A critical urge to urinate or defecate.

Source: wiktionary.org