onboard

adj

1. (not-comparable)Carried or used on or in a vehicle or vessel.

   ““We are aware that there has been an unauthorized release of video footage from flight deck cameras onboard USS Carl Vinson (CVN 70) of the F-35C Lightning II crash that occurred Jan. 24, in the South China Sea. There is an ongoing investigation into both the crash and the unauthorized release of the shipboard video footage,” Cmdr. Zach Harrell, spokesperson for Commander, Naval Air Forces, said in an email.”

   “Swinging onto the Treherbert branch under the new OLE, the train's onboard Passenger Information Screens announce we have entered a 'no alcohol' zone. That doesn't seem to help, as some of the passengers who joined us earlier seem 'well oiled' already.”

2. (broadly, figuratively, not-comparable)Being a part of, being included in, participating in.

   “When it comes to security, everybody seems to be as onboard as I am.”

   “James is onboard as a production manager.”

adv

1. (not-comparable)On or in a vehicle or vessel; aboard; on board.

verb

1. (figuratively)To become a part of a group; (transitive) to incorporate (someone) into a group.

   “It's easiest to onboard and offboard employees if you have a checklist to follow.”

2. (figuratively)To begin to use a product or service; to take (someone) on as a new customer of a product or service.