c.1300, "the East" (originally usually meaning what is now called the Mid-East), from O.Fr. orient (11c.), from L. orientem (nom. oriens) "the rising sun, the east, part of the sky where the sun rises," originally "rising" (adj.), prp. of oriri "to rise" (see orchestra). The Orient Express was a train that ran from Paris to Istanbul via Vienna 1883-1961, from the start associated with espionage and intrigue.
c.1727, originally "to arrange facing east," from Fr. s'orienter "to take one's bearings," lit. "to face the east" (also the source of Ger. orientierung), from O.Fr. orient "east," from L. orientum (see Orient (n.)). Meaning "determine bearings" first attested 1842; figurative sense is from 1850.