Req·ui·site, a.  Required by the nature of things, or by circumstances; so needful that it can not be dispensed with; necessary; indispensable.
     All truth requisite for men to know.   --Milton.
  Syn: -- Necessary; needful; indispensable; essential.
  -- Req*ui*site*ly, adv. -- Req*ui*site*ness, n.
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  requisiteness
       n : the state of being absolutely required