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on·board [or] on-board

onboard [or] on-board

parts of speech:
adjective, adverb, preposition
part of speech: adjective
pronunciation: an bord
definition 1: transported, used, or installed upon a ship, aircraft, or other vehicle.
All onboard luggage must be stowed in the bins or under the seat in front of you.The aircraft's onboard computer malfunctioned.
definition 2: agreeing to take part in or support.
If everyone is onboard with this plan, we'll get started next week.
part of speech: adverb
definition: onto a ship, aircraft, or other vehicle.
The passengers are going onboard now.
part of speech: preposition
pronunciation: an bord
definition: on or within (a ship, aircraft, or other vehicle).
Fortunately, one of the passengers onboard the airplane was a doctor.