Collins Concise English Dictionary © HarperCollins Publishers::

compulsory /kəmˈpʌlsərɪ/ adj
  1. required by regulations or laws; obligatory
  2. involving or employing compulsion; compelling; necessary; essential

comˈpulsorily adv comˈpulsoriness n

'compulsory' also found in these entries:
In the English description:

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