/ əˈbɔːd; NAmE əˈbɔːrd/ adverb , preposition
on or onto a ship, plane, bus or train
SYN on board :
We went aboard.
He was already aboard the plane.
The plane crashed killing all 157 passengers aboard.
All aboard! (= the bus, boat, etc. is leaving soon)
Welcome aboard! (= used to welcome passengers or a person joining a new organization, etc.)
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WORD ORIGIN
late Middle English : from a- to, towards (expressing motion) + board , reinforced by Old French à bord .