On board; into or within a ship or boat; hence, into or within a railway car.
Alongside; as, close aboard.
On board of; as, to go aboard a ship.
aboard in Dutch is aan boord
aboard in German is an Bord/anwesend, an Bord, anwesend
aboard in Norwegian is om bord
aboard in Portuguese is a bordo de
aboard in Spanish is a bordo, bordoa
aboard in Swedish is ombord