Mandatory
Definition 1 of 3
Pro Tip 1/3
Beyond Laws
Mandatory isn't used only for laws but for rules in organizations, schools, or clubs. Attendance is mandatory for all members at the club meetings.
Pro Tip 2/3
Safety Related
'Mandatory' is often used in safety contexts to mean 'necessary for safety'. It's mandatory to wash your hands before serving food.
Pro Tip 3/3
Not Optional
When something is mandatory, you cannot choose whether to follow it or not. Completing this course is mandatory for graduation.