onboard

Etymology

From on board, equivalent to on- + board.

adj

1. Carried or used on or in a vehicle or vessel
2. (by extension, figurative) 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. On or in a vehicle or vessel; aboard; on board.

verb

1. (figurative) To become a part of a group; to incorporate (someone) into a group.
2. (figurative) To begin to use a product or service; to take (someone) on as a new customer of a product or service.