American English

Definition of aboard adverb from the Oxford Advanced American Dictionary



    adverb, preposition
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  1. 1on or onto a ship, plane, bus, or train synonym on board
  2. 2 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 the Oxford Advanced Learner's Dictionary entry: aboard