(n.) The state or quality of being indispensable, or absolutely necessary.

absolute certainty absoluteness act of God assurance assuredness bare cupboard bare necessities bare subsistence beggarliness beggary call call for cause certain knowledge certainness certainty certitude coaction coercion compulsion compulsiveness condition constraint dead certainty decree definiteness demand demand for deprivation desideration desideratum destitution determinacy determinateness duress empty purse enforcement essential essentials exigency fate fatefulness force majeure forcing foredestiny foregone conclusion foreknowledge foreordination grinding poverty gripe hand-to-mouth existence homelessness impoverishment indefeasibility indigence indispensable indispensableness ineluctability inerrability inerrancy inescapableness inevasibleness inevitability inevitable accident inevitableness inexorability infallibilism infallibility inflexibility irresistibility irrevocability lack mendicancy moneylessness must must item necessaries necessities necessitousness need need for needfulness neediness nonambiguity noncontingency obligation obligement occasion pauperism pauperization penury pinch positiveness predestination predetermination preordination prerequirement prerequisite prescience privation probatum proved fact relentlessness requirement requisite requisiteness requisition restraint sine qua non sureness surety the necessary the needful truth unambiguity unavoidable casualty unavoidableness uncontrollability undeflectability unequivocalness univocity unmistakableness unpreventability unyieldingness vis major want