1. a serious, unexpected, and often dangerous situation requiring immediate action

1. relating to or used in an emergency

Examples

• The hospital declared a medical emergency when the accident victims arrived.
• Call 911 in case of emergency.
• The pilot made an emergency landing due to engine failure.
• Keep emergency supplies in your car during winter.
• The emergency exit is located at the back of the building.
• She used the emergency brake to stop the car quickly.
• The government declared a state of emergency after the hurricane.