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mandatory

[man-duh-tawr-ee, -tohr-ee] /ˈmæn dəˌtɔr i, -ˌtoʊr i/
adjective
1.
authoritatively ordered; obligatory; compulsory:
It is mandatory that all students take two years of math.
2.
pertaining to, of the nature of, or containing a command.
3.
Law. permitting no option; not to be disregarded or modified:
a mandatory clause.
4.
having received a mandate, as a nation.
noun, plural mandatories.
5.
Origin of mandatory
1655-1665
1655-65; < Late Latin mandātōrius. See mandate, -tory1
Related forms
mandatorily, adverb
nonmandatory, adjective, noun, plural nonmandatories.
unmandatory, adjective
Synonyms
1. requisite, exigent.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for mandatory

mandatory

/ˈmændətərɪ; -trɪ/
adjective
1.
having the nature or powers of a mandate
2.
obligatory; compulsory
3.
(of a state) having received a mandate over some territory
noun (pl) -ries
4.
Also called mandatary. a person or state holding a mandate
Derived Forms
mandatorily, adverb
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 mandatory
adj.

1570s, "of the nature of a mandate," from Late Latin mandatorius "pertaining to a mandator," from Latin mandatus, past participle of mandare (see mandate (n.)). Sense of "obligatory because commanded" is from 1818.

Online Etymology Dictionary, © 2010 Douglas Harper
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