verb (used with object), required, requiring.
to have need of; need: He requires medical care.
to call on authoritatively; order or enjoin to do something: to require an agent to account for money spent.
to ask for authoritatively or imperatively; demand.
to impose need or occasion for; make necessary or indispensable: The work required infinite patience.
to call for or exact as obligatory; ordain: The law requires annual income-tax returns.
to place under an obligation or necessity: The situation requires me to take immediate action.
Chiefly British. to desire; wish to have: Will you require tea at four o'clock?
verb (used without object), required, requiring.
to demand; impose obligation: to do as the law requires.

1300–50; Middle English requiren < Latin requīrere, equivalent to re- re- + -quīrere, combining form of quaerere to seek, search for (cf. quest)

requirable, adjective
requirer, noun
nonrequirable, adjective
prerequire, verb (used with object), prerequired, prerequiring.
quasi-required, adjective
unrequired, adjective

1. See lack. 3. See demand. 6. obligate, necessitate.

3. forgo. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
require (rɪˈkwaɪə)
1.  to have need of; depend upon; want
2.  to impose as a necessity; make necessary: this work requires precision
3.  (also intr) to make formal request (for); insist upon or demand, esp as an obligation
4.  to call upon or oblige (a person) authoritatively; order or command: to require someone to account for his actions
[C14: from Old French requerre, from Vulgar Latin requaerere (unattested) to seek after, from Latin requīrere to seek to know, but also influenced by quaerere to seek]
usage  The use of require to as in I require to see the manager or you require to complete a special form is thought by many people to be incorrect: I need to see the manager; you are required to complete a special form

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "to ask a question, inquire," from O.Fr. requerre, from V.L. *requærere, from L. requirere "seek to know, ask," from re- "repeatedly" + quærere "ask, seek" (see query). The original sense of this word has been taken over by request. Sense of "demand (someone)
to do (something)" is from 1751, via the notion of "to ask for imperatively, or as a right" (1380).
Online Etymology Dictionary, © 2010 Douglas Harper
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