onboard

Short definition from Wiktionary

Adjective

1. 1
   Carried or used on or in a vehicle or vessel.
2. 2
   Being a part of, being included in, participating in.

Adverb

1. 1
   On or in a vehicle or vessel; aboard; on board.

Verb

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