aboard

American  

[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.

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preposition

1. on board of; on, in, or into.

   to come aboard a ship.

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!

aboard British  

/ əˈbɔːd /

adverb

1. on, in, onto, or into (a ship, train, aircraft, etc)

2. nautical alongside (a vessel)

3. a warning to passengers to board a vehicle, ship, etc

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Etymology

Origin of aboard

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