Required - definition of required by The Free Dictionary
www.thefreedictionary.com › requiredrequired. adjective. 1. obligatory, prescribed, compulsory, mandatory, needed, set, demanded, necessary, called for, essential, recommended, vital, unavoidable, requisite, de rigueur (French) This book is required reading. obligatory voluntary, optional, not necessary, unimportant, elective, not vital, noncompulsory.