compulsory adj1 : required or compelled by law
: mandatory obligatory [ arbitration] [ insurance]
: required to be brought or asserted in a pleading because of having arisen from the transaction or occurrence that is the subject of litigation [a counterclaim] [ reconvention] compare elective , permissive
2 : using compulsion
: compelling [ measures]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.