/ Dictionary / Index O Orient Express: Meaning and Definition of Find definitions for: O'rient Express' Pronunciation: [key] an express passenger train in service between Paris and Istanbul from 1883 until 1977, using various routes. Some or parts of the routes continue to be served by regular service and by rail tours. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orienteering orifice Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language