require

[ri-kwahyuhr]
verb (used with object), required, requiring.
1.
to have need of; need: He requires medical care.
2.
to call on authoritatively; order or enjoin to do something: to require an agent to account for money spent.
3.
to ask for authoritatively or imperatively; demand.
4.
to impose need or occasion for; make necessary or indispensable: The work required infinite patience.
5.
to call for or exact as obligatory; ordain: The law requires annual income-tax returns.
6.
to place under an obligation or necessity: The situation requires me to take immediate action.
7.
Chiefly British. to desire; wish to have: Will you require tea at four o'clock?
verb (used without object), required, requiring.
8.
to demand; impose obligation: to do as the law requires.

Origin:
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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
require (rɪˈkwaɪə)
 
vb
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
 
re'quirable
 
adj
 
re'quirer
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

require
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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Example sentences
With scorching temperatures rising into triple digits, players are also
  required to take water breaks.
The fertility rate required in a country to keep its population steady.
They can't be scaled up, because more energy is required to produce the energy
  than can be generated.
Getting natural light into the room required going up through the attic to
  create a skylight.
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