Mandatory
来自Big Physics
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late 15th century: from late Latin mandatorius, from Latin mandatum ‘something commanded’.
wiktionary
From Late Latin mandatorius(“of or belonging to a mandator”), from mandator(“one who commands”); see mandate.
etymonline
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.
