An irresistible force or compulsion.
A condition that a solution to an optimization problem must satisfy.
A linkage or other restriction that maintains database integrity.
The repression of one's feelings.
Something that constrains; a restriction.
Something which makes an act or an event unavoidable; an irresistible force; overruling power.
Greater utilitarian good; used in justification of a criminal act.
Indispensable requirements (of life).
The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism.
The condition of being needy; desperate need; lack.
Something necessary; a requisite; something indispensable.
The quality or state of being necessary, unavoidable, or absolutely requisite.