We found 27 dictionaries that define the word mach number:

General (16 matching dictionaries)

1. Mach number: Merriam-Webster
2. Mach number: Oxford Learner's Dictionaries
3. Mach number: American Heritage Dictionary of the English Language
4. Mach number: Collins English Dictionary
5. Mach number: Vocabulary.com
6. Mach number: Wordnik
7. Mach number: Wiktionary
8. Mach number: The Wordsmyth English Dictionary-Thesaurus
9. mach number: Infoplease Dictionary
10. Mach number: Dictionary.com
11. Mach number: Wikipedia, the Free Encyclopedia
12. Mach number: Rhymezone
13. mach number: FreeDictionary.org
14. mach number: Mnemonic Dictionary
15. Mach number: TheFreeDictionary.com
16. Mach number: Merriam-Webster

Computing (1 matching dictionary)

17. Mach number: Encyclopedia

Medicine (2 matching dictionaries)

18. Mach number: Merriam-Webster Medical Dictionary
19. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

20. Mach number: Wordcraft Dictionary

Science (2 matching dictionaries)

21. Mach Number: Eric Weisstein's World of Physics
22. Mach Number: Extragalactic Astronomy

Tech (5 matching dictionaries)

23. DOD Dictionary of Military Terms (No longer online)
24. Glossary of Meteorology (No longer online)
25. PUMP AND SEAL TERMS (No longer online)
26. Dictionary for Avionics (No longer online)
27. Space and Electronic Warfare Lexicon (No longer online)

(Note: See mach_numbers as well.)

Definitions from Wiktionary (Mach number) ▸ noun:  (physics) The ratio of the speed of a body to that of sound in the surrounding medium. Similar: Mach's principle, speed of sound, gyromagnetic ratio, speed, magnitude, magnetophonon, wavenumber, modulus, specific power, form factor, more... Opposite: subsonic, slow Types: supersonic, hypersonic, supersonal, ultrasonic, more... Phrases: Critical Mach number, Drag-divergence Mach number, more... Adjectives: subsonic, level, power, transonic, retarded, centigrade, coherent, fringing, forcing, hole, differential ▸ Words similar to mach number ▸ Usage examples for mach number ▸ Idioms related to mach number ▸ Wikipedia articles (New!) ▸ Words that often appear near mach number ▸ Rhymes of mach number ▸ Invented words related to mach number