mandatory

Adjective

• required by rule
  • in most schools physical education is compulsory
    
  • attendance is mandatory
    
  • required reading
    

Noun

• a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves

• the recipient of a mandate

Related words

• Synonyms: 
  compulsory , required , mandate , mandatary