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English definition of “aboard”

aboard

adverb, preposition     /əˈbɔːd/ US  /-ˈbɔːrd/
C1 on or onto a ship , aircraft , bus , or train : The flight attendant welcomed 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 ).Boarding and alighting from modes of transportTravelling by aircraftAviationMovement through the air
(Definition of aboard adverbpreposition from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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