require

v.

1. To need

   want, lack, feel the necessity for, have need for; see need.

2. To insist upon

   demand, oblige, necessitate, obligate, claim, exact, requisition, command, order, dictate, challenge, expect, compel, entail, look for, push for, assert oneself, call for, take no denial; see also ask 1.

require suggests a pressing need, often one inherent in the nature of a thing, or the binding power of rules or laws voters are required to register; demand implies a calling for as due or necessary, connoting a peremptory exercise of authority or an imperative need to demand obedience; claim implies an assertion of one's right to possess something to claim a throne; exact implies a demanding and the enforcing of the demand at the same time to exact a promise of help from her friends, to exact payment by the end of the week See also syn. study at lack.