[uh-bawrd, uh-bohrd]
on board; on, in, or into a ship, train, airplane, bus, etc.: to step aboard.
alongside; to the side.
Baseball. on base: a homer with two aboard.
into a group as a new member: The office manager welcomed him aboard.
on board of; on, in, or into: to come aboard a ship.
all aboard!, (as a warning to passengers entering or planning to enter a train, bus, boat, etc., just before starting) Everyone get on!

1350–1400; Middle English abord(e) (see a-1, board), perhaps conflated with Middle French a bord

aboard, abort, abroad.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aboard (əˈbɔːd)
adv, —adj, —prep
1.  on, in, onto, or into (a ship, train, aircraft, etc)
2.  nautical alongside (a vessel)
3.  all aboard! a warning to passengers to board a vehicle, ship, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 15c., from O.Fr. à "on" + board "board," from Frank. *bord (see board); the "boarding" or sides of a vessel extended to the ship itself. The usual M.E. expression was within shippes borde. The call all aboard! as a warning to passengers is attested from 1838.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The air aboard commercial jetliners is considerably cleaner than almost
  everybody gives it credit for.
Characters in your films have excavated ancient sites and traveled the world
  aboard tramp steamers.
The sailors also left some more intimate items aboard the vessel.
The company even offered financing to bring the bands aboard.
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