Definition of aboard adverb from the Oxford Advanced Learner's Dictionary

 

aboard

 adverb,preposition
adverb, preposition
BrE BrE//əˈbɔːd//
 
; NAmE NAmE//əˈbɔːrd//
 
Plane travel, Train and bus travel, Parts of boats and ships, Travelling by boat or ship
 
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on or onto a ship, plane, bus or train synonym 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.) See related entries: Plane travel, Train and bus travel, Parts of boats and ships, Travelling by boat or ship Word Origin late Middle English: from a- ‘to, towards’ (expressing motion) + board, reinforced by Old French à bord.
See the Oxford Advanced American Dictionary entry: aboard