We found 48 dictionaries that define the word brightness:

General (24 matching dictionaries)

1. brightness: Merriam-Webster
2. brightness: Oxford Learner's Dictionaries
3. brightness: American Heritage Dictionary of the English Language
4. brightness: Collins English Dictionary
5. brightness: Vocabulary.com
6. Brightness, brightness: Wordnik
7. brightness: Cambridge Advanced Learner's Dictionary
8. brightness: Wiktionary
9. brightness: Webster's New World College Dictionary, 4th Ed.
10. brightness: Cambridge Essential American English Dictionary
11. Brightness (disambiguation), Brightness (sound), Brightness, The Brightness: Wikipedia, the Free Encyclopedia
12. Brightness: Online Plain Text English Dictionary
13. brightness: Webster's Revised Unabridged, 1913 Edition
14. brightness: Rhymezone
15. Brightness: AllWords.com Multi-Lingual Dictionary
16. brightness: Webster's 1828 Dictionary
17. brightness: FreeDictionary.org
18. brightness: Mnemonic Dictionary
19. brightness: TheFreeDictionary.com
20. brightness: The Wordsmyth English Dictionary-Thesaurus
21. brightness: Infoplease Dictionary
22. brightness: Dictionary.com

Art (3 matching dictionaries)

23. brightness: ArtLex Lexicon of Visual Art Terminology
24. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)
25. Technical Glossary of Theatre Terms (No longer online)

Business (1 matching dictionary)

26. brightness: Legal dictionary

Computing (3 matching dictionaries)

27. brightness: Free On-line Dictionary of Computing
28. brightness: CCI Computer
29. brightness: Encyclopedia

Medicine (3 matching dictionaries)

30. brightness: Merriam-Webster Medical Dictionary
31. online medical dictionary (No longer online)
32. brightness: Medical dictionary

Miscellaneous (1 matching dictionary)

33. brightness: Idioms

Science (3 matching dictionaries)

34. Brightness: Eric Weisstein's World of Mathematics
35. Brightness: Eric Weisstein's World of Physics
36. Brightness: Extragalactic Astronomy

Slang (1 matching dictionary)

37. Brightness: Urban Dictionary

Tech (9 matching dictionaries)

38. Book Binding (No longer online)
39. AUTOMOTIVE TERMS (No longer online)
40. brightness: Lighting Design Glossary
41. Glossary of Meteorology (No longer online)
42. Brightness: Nikonians Photo Glossary
43. Paper Making (No longer online)
44. National Weather Service Glossary (No longer online)
45. PhotoNotes Dictionary of Film and Digital Photography (No longer online)
46. brightness (luminance): Television: Critical Methods and Applications

Definitions from Wiktionary (brightness) ▸ noun:  The quality of being bright. ▸ noun:  The perceived luminance of an object. ▸ noun:  (idiomatic, figurative) Intelligence, cleverness. Similar: luminosity, luminance, luminousness, cleverness, smartness, light, shiningness, brilliancy, brilliance, brilliantness, more... Opposite: darkness, dimness, dullness, obscurity, murkiness Phrases: Surface brightness, Brightness temperature, apparent brightness, brightness control, brightness level, more... Adjectives: apparent, relative, same, maximum, high, intrinsic, equal, sudden, average, low, full ▸ Words similar to brightness ▸ Usage examples for brightness ▸ Idioms related to brightness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing brightness ▸ Words that often appear near brightness ▸ Rhymes of brightness ▸ Invented words related to brightness