required

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Concise Oxford English Dictionary © 2008 Oxford University Press:
require/rɪˈkwʌɪə(r)/
verb
  • 1 need or depend on.

    ■ wish to have.

  • 2 instruct or expect (someone) to do something.

    ■ (require something of) regard an action or quality as due from.

    ■ specify as compulsory: the minimum car insurance required by law.

– derivatives
requirer noun.
– origin ME: from OFr. requere, from L. requirere, from re- (expressing intensive force) + quaerere ‘seek’.
'required' also found in these Oxford entries:

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