a·board [uh-bawrd, uh-bohrd]

1. on board; on, in, or into a ship, train, airplane, vehicle, etc.

Come aboard the ship.

2. to the side.
3. Baseball. on base
4. into a group as a new member:

The committee welcomed him aboard.


5. on board; on, in, or into


6. all aboard!, (as a warning to passengers entering or planning to enter a train, bus, boat, etc., just before leaving) Everyone get on!


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

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