required
adj. US //ɹiˈkwaɪɝd// UK //ɹɪkwˈaɪəd// re·quired
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1 necessary or mandatory (adj.) B1 Intermediateneeded because of a rule, law, or specific purpose.
stipulated as necessary or obligatory by authority, rule, or circumstance.
ExampleAll students must complete the required reading before the first day of class.
ExampleThe safety inspector confirmed that the factory had installed all the required ventilation systems to meet the new environmental standards.