Necessity Definition
 nə-sĕsĭ-tē 
  necessities
  
    noun
  
 
    necessities
  
Anything that is inevitable, unavoidable, etc. as a result of natural law; that which is necessary in natural sequence.
 Webster's New World 
The power of natural law that cannot be other than it is; natural causation; physical compulsion placed on man by nature; fate.
 Webster's New World 
The compulsion or constraint of man-made circumstances, habit, custom, law, etc.; logical or moral conditions making certain actions inevitable or obligatory.
 Faced by the necessity to earn a living.
 Webster's New World 
What is required by this social or legal compulsion.
 Webster's New World 
The force exerted by circumstance.
 American Heritage 
Synonyms: 
  
    idiom
  
 
      of necessity
    
 - As an inevitable consequence; necessarily.
American Heritage  
      of necessity
    
 - necessarily; inevitably
Webster's New World  
Other Word Forms of Necessity
Noun
Singular:
 necessityPlural:
 necessitiesIdioms, Phrasal Verbs Related to Necessity
- of necessity
- of necessity
Origin of Necessity
-  From Middle English necessite, from Old French necessite, from Latin necessitas (“unavoidableness, compulsion, exigency, necessity"), from necesse (“unavoidable, inevitable"); see necessary. From Wiktionary 
-  Middle English necessite from Old French from Latin necessitās from necesse necessary necessary From American Heritage Dictionary of the English Language, 5th Edition 
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