Compulsory
Pronunciation : Com*pul"so*ry
Part of Speech : a.
Etymology : [LL. compulsorius.]
Definition : 1. Having the power of compulsion; constraining.
2. Obligatory; enjoined by authority; necessary; due to complusion. This contribution therestening fall infinitely short of their hopes, they soon made it compulsory. Burke.
Source : Webster's Unabridged Dictionary, 1913