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
1655–65; < Late Latin mandātōrius. See mandate, -tory1
Related forms
mandatorily, adverb
nonmandatory, adjective, noun, plural nonmandatories.
unmandatory, adjective
Synonyms
1. requisite, exigent.
British Dictionary definitions for non mandatory
mandatory (ˈmændətərɪ, -trɪ)
 
adj
1.  having the nature or powers of a mandate
2.  obligatory; compulsory
3.  (of a state) having received a mandate over some territory
 
n , -ries
4.  Also called: mandatary a person or state holding a mandate
 
'mandatorily
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin and History for non mandatory
mandatory
1570s, "of the nature of a mandate," from L.L. mandatorius "pertaining to a mandator," from mandatus, pp. of mandare (see mandate (n.)). Sense of "obligatory because commanded" is from 1818.
Online Etymology Dictionary, © 2010 Douglas Harper
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