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Synonyms
re·quire (rĭ-kwīŕ)

[Middle English requiren, from Old French requerre, from Vulgar Latin* requaerere, alteration (influenced by quaerere, to seek), of Latin requīrere, re-, re-, + quaerere, to seek.]

transitive verb: -quired, -quir·ing, -quires. 

  1. To have as a requisite; need: Most plants require sunlight.
  2. To call for as obligatory or appropriate; demand. See synonyms at demand
  3. To impose an obligation on; compel: Students are required to attend classes.

derivatives

re·quiŕa·ble
adjective
re·quiŕer
noun