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Definition of necessity:

  1. That which is necessary; a necessary; a requisite; something indispensable; - often in the plural.
  2. That which makes an act or an event unavoidable; irresistible force; overruling power; compulsion, physical or moral; fate; fatality.
  3. The condition of being needy or necessitous; pressing need; indigence; want.
  4. The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism.
  5. The quality or state of being necessary, unavoidable, or absolutely requisite; inevitableness; indispensableness.


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