[on-bawrd, -bohrd, awn-]
provided, occurring, etc., on a vehicle: among the ship's many on-board services.
installed and functional within a vehicle: on-board computers for aircraft.
Also, onboard.

1965–70; adj. use of adv. phrase on board

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  onboard1
Part of Speech:  adj
Definition:  See on-board
Main Entry:  onboard2
Part of Speech:  adj
Definition:  See on-board
Dictionary.com's 21st Century Lexicon
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Word Origin & History

1966 as one word, from on + board (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Having the tabloid staple onboard led to a ratings spike, too.
Punch began as a sailors' drink, where everyone onboard-officers and ordinary seamen alike-would partake together.
The craft would then switch to an onboard oxygen supply and the motor would
  become a pure rocket.
Airline lounges and onboard policies also affect behavior.
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