mandatory
adjective
[ ˈmandət(ə)ri ]
• required by law or mandate; compulsory.
• "wearing helmets was made mandatory for pedal cyclists"
Similar:
obligatory,
compulsory,
binding,
required,
inescapable,
unavoidable,
requisite,
necessary,
essential,
imperative,
mandatory
noun
• variant spelling of mandatary.
Origin:
late 15th century: from late Latin mandatorius, from Latin mandatum ‘something commanded’.
mandatary
noun
• a person or state receiving a mandate.
Origin:
late 15th century (denoting a person appointed by a papal mandate): from late Latin mandatarius, from mandatum (see mandate).