The Collaborative International Dictionary
Compulsatory
Compulsatory \Com*pul"sa*to*ry\, a. Operating with force; compelling; forcing; constraining; resulting from, or enforced by, compulsion. [R.]
To recover of us, by strong hand
And terms compulsatory, those foresaid lands.
--Shak.
Wiktionary
compulsatory
a. Enforced by or resulting from compulsion; employing force or constraint; compulsory.