onboard

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

Refers to a chip or other hardware component that is directly attached to the printed circuit board (motherboard). Contrast with offboard. See inboard.

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Joining in or participating, as in The department head addressed the new employees, saying "Welcome on board," or The opera company has a new vocal coach on board to help the soloists. This expression alludes to being on or in a vessel, airplane, or other vehicle. [Colloquial; second half of 1900s]

In games such as hold'em and Omaha, these cards are the community cards.

SoundPoker Says: In a game of hold'em if the community cards showed A-10-9-6-2 (mixed suit) these would then be the cards "on board".

See Also: Board, Community Cards

The adverb has one meaning:

Meaning #1: on a ship, train, plane or other vehicle
  Synonym: aboard