requirement (
http://definr.com/requirement)
n 1: required activity; "the requirements of his work affected
his health"; "there were many demands on his time" [syn:
demand]
2: 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,
requisite,
necessary]
[ant:
inessential]
3: something that is required in advance; "Latin was a
prerequisite for admission" [syn:
prerequisite]