expeditionary adjective 2noun 1forms 1 adjective2 •Of or pertaining to an expedition. •Intended for military operations abroad. noun[in the plural]1 •One who goes on expeditions, especially one who is a member of an expeditionary military force.[...] turned out in its best attire to receive the Brazilian expeditionaries and the group of soldiers representing the gallant U.S. 10th Mountain Division. — 1966 formsexpeditionaries
