Webster's English Dictionary

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mandatory

1. man.da.to.ry \'man-d*-.to-r-e-, -.to.r-\ aj 1: containing or 
   constituting a command : OBLIGATORY  2: of, relating to, or holding a 
   League of Nations mandate 
2. mandatory n : one given a mandate; esp : a nation holding a mandate from 
   the L eague of Nations