aboard Definition in the Cambridge English Dictionary
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Definition of “aboard” - English Dictionary

Definition of "aboard" - American English Dictionary

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aboardpreposition, adverb [not gradable]

 us   /əˈbɔrd, -ˈboʊrd/
on or onto a ​ship, ​aircraft, ​bus, or ​train: We ​finally went aboard the ​plane three ​hourslater.
(Definition of aboard from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "aboard" - British English Dictionary

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aboardadverb, preposition

uk   /əˈbɔːd/  us   /-ˈbɔːrd/
C1 on or onto a ​ship, ​aircraft, ​bus, or ​train: The ​flightattendantwelcomed us aboard. Welcome aboard ​flight BA345 to Tokyo. The train's about to ​leave. All aboard! We ​spent two ​months aboard ​ship (= on the ​ship).
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(Definition of aboard from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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