compromiˈssorial,a.rare—0. [f. L. type *comprōmissōri-us (cf. F. compromissoire: see -ory) + -al1.] = compromissary. 1681Blount Glossogr. (ed. 5), Compromissorial, pertaining to the Authority granted the Arbiter by consent of the Parties.1721in Bailey.1755in Johnson; and in mod. Dicts.