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compulsory

[kuh m-puhl-suh-ree]
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adjective
  1. required; mandatory; obligatory: compulsory education.
  2. using compulsion; compelling; constraining: compulsory measures to control rioting.
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noun, plural com·pul·so·ries.
  1. 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.
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Origin of compulsory

1510–20; < Medieval Latin compulsōrius, equivalent to Latin compul-, variant stem of compellere (see compel) + -sōrius, for -tōrius -tory1; cf. compulsive
Related formscom·pul·so·ri·ly, adverbcom·pul·so·ri·ness, nounnon·com·pul·so·ri·ly, adverbnon·com·pul·so·ri·ly·ness, nounnon·com·pul·so·ry, adjectivequa·si-com·pul·so·ri·ly, adverbqua·si-com·pul·so·ry, adjectiveun·com·pul·so·ry, adjective

Antonyms

1, 2. voluntary.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for quasi-compulsory

compulsory

adjective
  1. required by regulations or laws; obligatorycompulsory education
  2. involving or employing compulsion; compelling; necessary; essential
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Derived Formscompulsorily, adverbcompulsoriness, 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

Word Origin and History for quasi-compulsory

compulsory

adj.

1580s, from Medieval Latin compulsorius, from Latin compulsus, past participle of compellere (see compel).

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Online Etymology Dictionary, © 2010 Douglas Harper