bon voyage(n = noun.communication) send-off - an organized expression of goodwill at the start of a trip or new venture;
is a kind of farewell, word of farewell

bon voyage, int. & n. an expression of good wishes to a departing traveller.

Etymology:
F

N  navigation, aquatics, boating, yachting, ship, oar, paddle, screw, sail, canvas, aileron, natation, swimming, fin, flipper, fish's tail, aerostation, aerostatics, aeronautics, balloonery, balloon, ballooning, aviation, airmanship, flying, flight, volitation, wing, pinion, rocketry, space travel, astronautics, orbital mechanics, orbiting, voyage, sail, cruise, passage, circumnavigation, periplus, headway, sternway, leeway, fairway, mariner, flight, trip, shuttle, run, airlift, sailing, volant, aerostatic, seafaring, nautical, maritime, naval, seagoing, coasting, afloat, navigable, aerial, aeronautic, grallatory, under way, under sail, under canvas, under steam, on the wing, in flight, in orbit, bon voyage, spread the thin oar and catch the driving gale.

bon, bon mot, bon sil'8ane, bon ton, bon vivant, maiden voyage, voyage