Definition from macmillandictionary.com
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Working with these children requires a great deal of patience.
a medical condition requiring urgent treatment
The cause of the accident is still unclear and requires further investigation.
Car insurance is required by law in most countries.
No previous knowledge of Arabic is required for admission to the university.
The agreement requires all parties to renounce the use of violence.
The amount that patients are required to pay has been raised.
His poems are now required reading on most literature courses.