- requirement, demand - required activity; "the requirements of his work affected his health"; "there were many demands on his time"
--1 is a kind of duty, responsibility, obligation
Derived forms: verb require1, verb require2 - necessity, essential, requirement, requisite, necessary - 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"
--2 is a kind of thing
--2 has particulars: desideratum; must; need, wantDerived form: verb require4 - prerequisite, requirement - something that is required in advance; "Latin was a prerequisite for admission"
--3 is a kind of duty, responsibility, obligation
--3 has particulars:precondition; academic requirement; essential condition, sine qua non