Meaning

noun the recipient of a mandate

noun 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

adjective required by rule

originFrom Late Latin mandatorius (“of or belonging to a mandator”), from mandātor (“one who commands”), equivalent to mandate + -ory; see mandate.

Etymology from Wiktionary, CC BY-SA 3.0