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compulsory

[kuh m-puhl-suh-ree] /kəmˈpʌl sə ri/
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
1510-1520
1510-20; < Medieval Latin compulsōrius, equivalent to Latin compul-, variant stem of compellere (see compel) + -sōrius, for -tōrius -tory1; cf. compulsive
Related forms
compulsorily, adverb
compulsoriness, noun
noncompulsorily, adverb
noncompulsorilyness, noun
noncompulsory, adjective
quasi-compulsorily, adverb
quasi-compulsory, adjective
uncompulsory, adjective
Antonyms
1, 2. voluntary.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for noncompulsory

compulsory

/kəmˈpʌlsərɪ/
adjective
1.
required by regulations or laws; obligatory compulsory education
2.
involving or employing compulsion; compelling; necessary; essential
Derived Forms
compulsorily, adverb
compulsoriness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for noncompulsory
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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