a sudden, urgent, usually unexpected occurrence or occasion requiring immediate action.

a state, esp. of need for help or relief, created by some unexpected event

a weather emergency; a financial emergency.

granted, used, or for use in an emergency

an emergency leave; emergency lights.

noun

calm , peace

noun

accident , climax , clutch * , compulsion , crossroad , crunch * , depression , difficulty , distress , exigency , extremity , fix , hole , impasse , juncture , meltdown , misadventure , necessity , pass , pinch * , plight , predicament , pressure , push , quandary , scrape , squeeze , strait , tension , turning point , urgency , vicissitude , zero hour * , flash point , crisis , crunch , dilemma , flashpoint , pinch

adjective

backup , reserve , secondary , standby , supplemental , supplementary