Require is defined as to need or demand.(verb)
An example of to require is someone needing sleep when they are very tired.
See require in Webster's New World College Dictionary
Origin: ME requiren < base of OFr requerre < VL *requaerere, for L requirere < re-, again + quaerere, to ask
See require in American Heritage Dictionary 4
transitive verb re·quired, re·quir·ing, re·quires
Origin: Middle English requiren
Origin: , from Old French requerre
Origin: , from Vulgar Latin *requaerere
Origin: , alteration (influenced by quaerere, to seek)
Origin: of Latin requīrere
Origin: : re-, re-
Origin: + quaerere, to seek.
Learn more about require