noun, plural emergencies.
a sudden, urgent, usually unexpected occurrence or occasion requiring immediate action.
a state, especially 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.

1625–35; < Medieval Latin ēmergentia, equivalent to ēmerg- (see emerge) + -entia -ency. See emergent

nonemergency, adjective, noun, plural nonemergencies.
postemergency, adjective
preemergency, adjective, noun, plural preemergencies.

1. exigency, extremity, pinch, quandary, plight. Emergency, crisis, straits refer to dangerous situations. An emergency is a situation demanding immediate action: A power failure created an emergency in transportation. A crisis is a vital or decisive turning point in a condition or state of affairs, and everything depends on the outcome of it: Help arrived when affairs had reached a crisis. Strait (usually straits ) suggests a pressing situation, often one of need or want: The family was in desperate straits for food and clothing.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
emergency (ɪˈmɜːdʒənsɪ)
n , pl -cies
1.  a.  an unforeseen or sudden occurrence, esp of a danger demanding immediate remedy or action
 b.  (as modifier): an emergency exit
2.  a.  a patient requiring urgent treatment
 b.  (as modifier): an emergency ward
3.  state of emergency a condition, declared by a government, in which martial law applies, usually because of civil unrest or natural disaster
4.  (NZ) a player selected to stand by to replace an injured member of a team; reserve

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"unforeseen occurrence requiring immediate attention," 1630s, from L. emergens, prp. of emergere (see emerge).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
How many human emergencies can be transported to needed medical care within
They have protocols and checklists for bad weather, emergencies, the
  inoculations they must dispense.
He has shown himself able to meet with calmness the great emergencies of the
Occasionally it enables one to meet emergencies in the best possible fashion.
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