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A valid ID is required for entry.
Attendance is required at the meeting.

"}},{"@type":"Question","name":"What are the synonyms of \"required\"?","acceptedAnswer":{"@type":"Answer","text":"

compulsory: required by law or a rule, obligatory, mandatory
essential: absolutely necessary, extremely important
needed: required, necessary, essential, crucial
obligatory: required by law or duty; mandatory

"}},{"@type":"Question","name":"What are the antonyms of \"required\"?","acceptedAnswer":{"@type":"Answer","text":"

discretionary: based on or subject to one's discretion or judgment
optional: left to one's choice; not required

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