We found 27 dictionaries that define the word on board:

General (17 matching dictionaries)

1. on board: Longman Dictionary of Contemporary English
2. on board: Merriam-Webster
3. on-board, on board: Oxford Learner's Dictionaries
4. on board: Collins English Dictionary
5. on board: Vocabulary.com
6. On-Board, On-board, on-board, on board: Wordnik
7. on-board, on board: Cambridge Advanced Learner's Dictionary
8. on-board, on board: Wiktionary
9. on-board: Infoplease Dictionary
10. On board, on-board, on board: Dictionary.com
11. on-board: Cambridge Essential American English Dictionary
12. On Board (film), On Board: Wikipedia, the Free Encyclopedia
13. on board: FreeDictionary.org
14. on board: Mnemonic Dictionary
15. on-board, on board: TheFreeDictionary.com

Business (5 matching dictionaries)

16. on board: Merriam-Webster Legal Dictionary
17. MoneyGlossary.com (No longer online)
18. On board: Bloomberg Financial Glossary
19. On board, on-board: Financial dictionary
20. BusinessDictionary.com (No longer online)

Medicine (1 matching dictionary)

21. on board: Merriam-Webster Medical Dictionary

Miscellaneous (1 matching dictionary)

22. on board: Idioms

Slang (1 matching dictionary)

23. on board: Green’s Dictionary of Slang

Tech (2 matching dictionaries)

24. SeaTalk Dictionary of English Nautical Language (No longer online)
25. On Board: Latitude Mexico

Definitions from Wiktionary (on board) ▸ adjective:  On or in a means of transportation. ▸ adjective:  (idiomatic) Joining in or participating. ▸ adjective:  (idiomatic) Agreeing or supporting. ▸ adjective:  (idiomatic) Into itself or oneself. Similar: airborne, shipwide, alongshore, high, in place, incumbent, deckwise, onward, roadwise, headed, more... Opposite: off board, not on board, disembark Types: ", more... Phrases: free on board, take on board, Chip on board, takes on board, taking on board, more... Adjectives: upline, carryon, automotive, twinning, way, main line, overhead, hole, draft, carry-on Colors:     teal,     seafoam,     coral,     aqua,     turquoise, more... ▸ Words similar to on board ▸ Usage examples for on board ▸ Idioms related to on board ▸ Wikipedia articles (New!) ▸ Popular nouns described by on board ▸ Words that often appear near on board ▸ Rhymes of on board ▸ Invented words related to on board