Definition of "onboard" in English

adjective

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.

adverb

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.