I wish to know the difference between these words. I only know few examples of them being used in speech for now: Mandatory circumcision and Obligatory military service. In my native language, we use same word in both cases so I can't seem to be able to tell the diffrence.

marked as duplicate by Lawrence, sumelic, Rob_Ster, NVZ, ab2 Apr 9 '16 at 18:20

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