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aboard

[uh-bawrd, uh-bohrd] /əˈbɔrd, əˈboʊrd/
adverb
1.
on board; on, in, or into a ship, train, airplane, bus, etc.:
to step aboard.
2.
alongside; to the side.
3.
Baseball. on base:
a homer with two aboard.
4.
into a group as a new member:
The office manager welcomed him aboard.
preposition
5.
on board of; on, in, or into:
to come aboard a ship.
Idioms
6.
all aboard!, (as a warning to passengers entering or planning to enter a train, bus, boat, etc., just before starting) Everyone get on!
Origin
1350-1400
1350-1400; Middle English abord(e) (see a-1, board), perhaps conflated with Middle French a bord
Can be confused
aboard, abort, abroad.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for all aboard!

aboard

/əˈbɔːd/
adverb, adjective, preposition (postpositive)
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for all aboard!
aboard
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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