requisite


requisite (http://definr.com/requisite)

     adj : necessary for relief or supply; "provided them with all
           things needful" [syn: needed, needful, required]
     n : anything indispensable; "food and shelter are necessities of
         life"; "the essentials of the good life"; "allow farmers
         to buy their requirements under favorable conditions"; "a
         place where the requisites of water fuel and fodder can
         be obtained" [syn: necessity, essential, requirement,
          necessary] [ant: inessential]