Necessity meaning : The quality or state of being necessary, unavoidable, or absolutely requisite. The condition of being needy; desperate need; lack Something necessary; a requisite; something indispensable. Something which makes an act or an event unavoidable; an irresistible force; overruling power The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism. Greater utilitarian good; used in justification of a criminal act. (in the plural) Indispensable requirements (of life).