Webster's Revised Unabridged Dictionary · 1913

Necessity

Necessity , noun

[Old English necessite, French nécessité, Latin necessitas, from 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. — Shakespeare
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. — Shakespeare
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.
(Metaphysics) The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism.
Collocations (1)
Of necessity , by necessary consequence; by compulsion, or irresistible power; perforce.