mandatory

[man-duh-tawr-ee, -tohr-ee]
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.

Origin:
1655–65; < Late Latin mandātōrius. See mandate, -tory1

mandatorily, adverb
nonmandatory, adjective, noun, plural nonmandatories.
unmandatory, adjective


1. requisite, exigent.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

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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Example sentences
Doesn't seem cooked food is so mandatory to explain all this required energy
  and smaller teeth.
His charge carries a mandatory minimum sentence of three and a half years in
  prison and a maximum of 15 years.
They are determined based on the team's total final riding time and the last
  mandatory veterinary checks.
There are no mandatory laws stating that you will have a set work week.
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