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aboard

1 aboard ˈboɚd/ adverb
1 aboard
ˈboɚd/
adverb
Britannica Dictionary definition of ABOARD
: on, onto, or within a train, a ship, an airplane, etc.
All aboard! is a call for passengers to get onto a ship or train because it is ready to leave.
2 aboard ˈboɚd/ preposition
2 aboard
ˈboɚd/
preposition
Britannica Dictionary definition of ABOARD
: on or into (a train, ship, etc.)