1605-15; < Late Latinmandātārius one to whom a charge is given. See mandate, -ary
Examples from the web for mandatary
We will continue to do this to ensure everyone is making progress for this mandatary training.
Word Origin and History for mandatary
n.
"person to whom a mandate has been given," 1610s, from Latin mandatarius "one to whom a charge or commission has been given," from mandatus, past participle of mandare (see mandate (n.)).