Etymology
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mandatory (adj.)

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

updated on November 12, 2018

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Definitions of mandatory from WordNet
1
mandatory (n.)
the recipient of a mandate;
Synonyms: mandatary
mandatory (n.)
a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves;
Synonyms: mandate
2
mandatory (adj.)
required by rule;
attendance is mandatory
Synonyms: compulsory / required
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.