From Longman Dictionary of Contemporary Englishmandatoryman‧da‧to‧ry /ˈmændətəri $ -tɔːri/ ●○○ adjective MUSTif something is mandatory, the law says it must be done SYN compulsory, obligatory, → discretionarymandatory 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.► see thesaurus at necessary
Examples from the Corpus
mandatory• The validation of our model using the same selection criteria was also mandatory.• Wearing a helmet when riding a motorcycle is mandatory.• Can some one explain how kids' birthday parties became mandatory and, frequently, icky?• Those in charge of drawing up a blueprint for health-care reform talk of slapping mandatory controls on all drug prices.• Drug smuggling carries a mandatory death sentence.• In some countries, wearing helmets is mandatory for all cyclists.• It is mandatory for riders under 21, and costs $ 65.• The court made a mandatory order compelling the vendor to allow the person to enter so that the valuation could proceed.• The company's mandatory retirement age is 65.• The next-closest school is Morse, a perennial football power and mandatory stop for major-college recruiters.• The overarching concern regarding mandatory therapy is not whether it is just or moral but whether it cures or improves.made ... mandatory• The popular president not only made it acceptable for male politicians to sob; he made it practically mandatory.• It was hoped some aspects of traffic separation would be made mandatory, although he would not specify which.• In July 1989 wearing helmets was made mandatory for pedal cyclists.• Another is a type of safety net that in 1986 was made mandatory on all construction sites.• The court made a mandatory order compelling the vendor to allow the person to enter so that the valuation could proceed.From Longman Business Dictionarymandatoryman‧da‧to‧ry /ˈmændətəri-tɔːri/ adjectiveLAW something that is mandatory must be done, usually because the law or an official rule says soSYNCOMPULSORY, OBLIGATORYThey face mandatory retirement at age 65.mandatory testing of car-exhaust systems 