authoritatively ordered; obligatory; compulsory: It is mandatory that all students take two years of math.
pertaining to, of the nature of, or containing a command.
Law. permitting no option; not to be disregarded or modified: a mandatory clause.
having received a mandate, as a nation.
noun, plural man·da·to·ries.
Origin of mandatory
Synonyms for mandatory
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
having the nature or powers of a mandate
(of a state) having received a mandate over some territory
noun plural -ries
Also called: mandatary a person or state holding a mandate
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
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