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The Collaborative International Dictionary
Of necessity

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.

  2. The condition of being needy or necessitous; pressing need; indigence; want.

    Urge the necessity and state of times.
    --Shak.

    The extreme poverty and necessity his majesty was in.
    --Clarendon.

  3. That which is necessary; a necessary; a requisite; something indispensable; -- often in the plural.

    These should be hours for necessities, Not for delights.
    --Shak.

    What was once to me Mere matter of the fancy, now has grown The vast necessity of heart and life.
    --Tennyson.

  4. That which makes an act or an event unavoidable; irresistible force; overruling power; compulsion, physical or moral; fate; fatality.

    So spake the fiend, and with necessity, The tyrant's plea, excused his devilish deeds.
    --Milton.

  5. (Metaph.) The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism.

    Of necessity, by necessary consequence; by compulsion, or irresistible power; perforce.

    Syn: See Need.

WordNet
of necessity

adv. in such a manner as could not be otherwise; "it is necessarily so"; "we must needs by objective" [syn: inevitably, necessarily, needs]