UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˈbɔːrd/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/əˈbɔrd/ ,USA pronunciation: respelling(ə bôrd, ə bōrd)

WordReference Random House Learner's Dictionary of American English © 2020
a•board /əˈbɔrd/USA pronunciation   adv., prep. 
  1. on, in, or into (a ship, train, airplane, etc.):The ship sank, drowning all who were aboard. They went aboard the ship.

WordReference Random House Unabridged Dictionary of American English © 2020
a•board  (ə bôrd, ə bōrd),USA pronunciation adv. 
  1. on board;
    on, in, or into a ship, train, airplane, bus, etc.:to step aboard.
  2. alongside;
    to the side.
  3. Sport[Baseball.]on base:a homer with two aboard.
  4. all aboard! (as a warning to passengers entering or planning to enter a train, bus, boat, etc., just before starting) Everyone get on!
  5. into a group as a new member:The office manager welcomed him aboard.

  1. on board of;
    on, in, or into:to come aboard a ship.
  • Middle English abord(e) (see a-1, board), perh. conflated with Middle French a bord 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::
aboard /əˈbɔːd/ adv , adj , prep (postpositive)
  1. on, in, onto, or into (a ship, train, aircraft, etc)
  2. alongside (a vessel)
  3. all aboard!a warning to passengers to board a vehicle, ship, etc
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