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re·quire / riˈkwīr/ • v. [tr.] need for a particular purpose; depend on for success or survival: three patients required operations. ∎  cause to be necessary: it would have required much research to produce a comprehensive list. ∎  specify as compulsory: the minimum car insurance required by law. ∎  [tr.] (of someone in authority) instruct or expect (someone) to do something: you will be required to attend for cross-examination. ∎  (require something of) regard an action, ability, or quality as due from (someone) by virtue of their position: the care and diligence required of him as a trustee. ∎  wish to have: please indicate how many tickets you require.DERIVATIVES: re·quire·ment·quir·er n.