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Definition of On board
1. Adverb. On a ship, train, plane or other vehicle.
Exact synonyms: Aboard
Definition of On board
1. Adjective. (idiomatic) On or in a means of transportation. ¹
2. Adjective. (idiomatic) Joining in or participating. ¹
3. Adjective. (idiomatic) Agreeing or supporting. ¹
4. Adverb. On a vehicle or vessel; aboard ¹
¹ Source: wiktionary.com