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Mandatory (adjective)
Obligatory; required or commanded by authority.
“Attendance at a school is usually mandatory for children.”
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Mandatory (adjective)
Of, being or relating to a mandate.
“Mandatory Palestine”
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Mandatory (noun)
A person, organisation or state who receives a mandate; a mandatary.
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Mandatorily (adverb)
In a mandatory manner; not optionally; required.
Wiktionary
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Mandatory (adjective)
required by law or mandate; compulsory
“wearing helmets was made mandatory for pedal cyclists”
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Mandatory (adjective)
of or conveying a command
“he did not want the guidelines to be mandatory”
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Mandatory (noun)
variant spelling of mandatary
Oxford Dictionary