1 need; depend on for success or fulfilment (the work requires much patience).
2 lay down as an imperative (did all that was required by law).
3 command; instruct (a person etc.).
4 order; insist on (an action or measure).
5 (often foll. by of, from, or that + clause) demand (of or from a person) as a right.
6 wish to have (is there anything else you require?).
Derivatives:
requirer n. requirement n.
Etymology: ME f. OF requere ult. f. L requirere (as RE-, quaerere seek)
Useful english dictionary. 2012.