compulsory

[kuhm-puhl-suh-ree]
adjective
1.
required; mandatory; obligatory: compulsory education.
2.
using compulsion; compelling; constraining: compulsory measures to control rioting.
noun, plural compulsories.
3.
something, as an athletic feat, that must be performed or completed as part of a contest or competition: The ice skater received a higher score on the compulsories than on her freestyle performance.

Origin:
1510–20; < Medieval Latin compulsōrius, equivalent to Latin compul-, variant stem of compellere (see compel) + -sōrius, for -tōrius -tory1; cf. compulsive

compulsorily, adverb
compulsoriness, noun
noncompulsorily, adverb
noncompulsorilyness, noun
noncompulsory, adjective
quasi-compulsorily, adverb
quasi-compulsory, adjective
uncompulsory, adjective


1, 2. voluntary.
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World English Dictionary
compulsory (kəmˈpʌlsərɪ)
 
adj
1.  required by regulations or laws; obligatory: compulsory education
2.  involving or employing compulsion; compelling; necessary; essential
 
com'pulsorily
 
adv
 
com'pulsoriness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

compulsory
1580s, from L. *compulsorius, from compulsor "a compeller," agent noun from compellere (see compel).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Before tests for doping became compulsory and efficient, the use of drugs to
  enhance performance was epidemic.
Or make sure the government imposes compulsory purchase of them for you in the
  form of cap and trade.
Compulsory sterilization is the only alternative to universal poverty.
He proclaimed compulsory education, and ordered that under-officers be required
  to teach school.
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