Longman Dictionary of Contemporary English homepage

mandatory

adjective
     
man‧da‧to‧ry
if something is mandatory, the law says it must be done [= compulsory, obligatory; ↪ discretionary]
mandatory for
Crash helmets are mandatory for motorcyclists.
Murder carries a mandatory life sentence.
The Council has made it mandatory for all nurses to attend a refresher course every three years.

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