aboard adverb definition in Travelling by boat or ship topic from the Oxford Advanced Learner's Dictionary

aboard

 adverbpreposition: Travelling by boat or ship topic
on or onto a ship, plane, bus or train 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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