Synonyms and related words :
appropriate, bare necessities, boundary condition, call for, called for, catch, clause, condign, condition, demand, demand for, deserved, desideration, desideratum, donnee, due, escalator clause, escape clause, escape hatch, essential, essentials, fine print, given, grounds, indicated, indispensable, irreducible, irreductible, irreplaceable, joker, kicker, limiting condition, merited, must, must item, necessaries, necessary, necessities, necessity, need, need for, needed, needful, obligation, occasion, parameter, prerequirement, prerequisite, provision, provisions, proviso, required, requirement, requisition, right, rightful, saving clause, sine qua non, small print, specification, stipulation, string, suitable, terms, the necessary, the needful, ultimatum, unforgoable, vital, want, wanted, whereas