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aboard

[uh-bawrd, uh-bohrd]
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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.
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preposition
  1. on board of; on, in, or into: to come aboard a ship.
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Idioms
  1. all aboard! (as a warning to passengers entering or planning to enter a train, bus, boat, etc., just before starting) Everyone get on!
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Origin of aboard

1350–1400; Middle English abord(e) (see a-1, board), perhaps conflated with Middle French a bord
Can be confusedaboard abort abroad
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for aboard

aboard

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
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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

Word Origin and History for aboard

adv.

late 14c., probably in most cases from Old French à bord, from à "on" + bord "board," from Frankish *bord or a similar Germanic source (see board (n.2)); the "boarding" or sides of a vessel extended to the ship itself. The usual Middle English expression was within shippes borde. The call all aboard! as a warning to passengers is attested from 1838.

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Online Etymology Dictionary, © 2010 Douglas Harper