required required /riːˈkwaɪrd/

adjective

1. () Necessary for relief or supply  ( needful , requisite , required , needed )
   necessary for relief or supply
    Provided them with all things needful
   provided them with all things needful
   
2. () Required by rule  ( compulsory , required , mandatory )
   required by rule
    In most schools physical education is compulsory
   in most schools physical education is compulsory
    Attendance is mandatory
   attendance is mandatory
    Required reading
   required reading