Located on or belonging to a ship, airplane, or other vehicle; also means to officially accept someone as part of a team or organization.
Combination of 'on' and 'board' (meaning the deck of a ship), originally a nautical term from the 1600s that expanded to mean any mode of transport.
Companies now use 'onboard' as a verb meaning to hire someone ('we onboarded three new employees'), showing how maritime vocabulary keeps getting recycled for modern business.
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