'Necessity' definitions:

Definition of 'necessity'

From: WordNet
noun
The condition of being essential or indispensable
noun
Anything indispensable; "food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained" [syn: necessity, essential, requirement, requisite, necessary] [ant: inessential, nonessential]

Definition of 'Necessity'

From: GCIDE
  • Necessity \Ne*ces"si*ty\, n.; pl. Necessities. [OE. necessite, F. n['e]cessit['e], L. necessitas, fr. necesse. See Necessary.]
  • 1. The quality or state of being necessary, unavoidable, or absolutely requisite; inevitableness; indispensableness. [1913 Webster]
  • 2. The condition of being needy or necessitous; pressing need; indigence; want. [1913 Webster]
  • Urge the necessity and state of times. --Shak. [1913 Webster]
  • The extreme poverty and necessity his majesty was in. --Clarendon. [1913 Webster]
  • 3. That which is necessary; a necessary; a requisite; something indispensable; -- often in the plural. [1913 Webster]
  • These should be hours for necessities, Not for delights. --Shak. [1913 Webster]
  • What was once to me Mere matter of the fancy, now has grown The vast necessity of heart and life. --Tennyson. [1913 Webster]
  • 4. That which makes an act or an event unavoidable; irresistible force; overruling power; compulsion, physical or moral; fate; fatality. [1913 Webster]
  • So spake the fiend, and with necessity, The tyrant's plea, excused his devilish deeds. --Milton. [1913 Webster]
  • 5. (Metaph.) The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism. [1913 Webster]
  • Of necessity, by necessary consequence; by compulsion, or irresistible power; perforce. [1913 Webster]
  • Syn: See Need. [1913 Webster]

Synonyms of 'necessity'

From: Moby Thesaurus