from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Carried or used aboard a vehicle or vessel: onboard radar systems.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Carried or used on or in a vehicle or vessel
  • adv. On or in a vehicle or vessel; aboard; on board.


From on board, equivalent to on- +‎ board. (Wiktionary)


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