onboard /ɒnˈbɔːd/adjective 2verb 2adverb 1noun 1forms 3 adjective2 •Carried or used on or in a vehicle or vessel. •(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. verb2 •(figurative) 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. — 2022 •(figurative) To begin to use a product or service; to take (someone) on as a new customer of a product or service. adverb1 •On or in a vehicle or vessel; aboard; on board. noun1 •A feed, video, image, etc., taken of a vehicle's situation, from a position that is on the vehicle. formsonboarded · onboarding · onboards