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