We found 22 dictionaries that define the word background noise:

General (13 matching dictionaries)

1. background noise: Merriam-Webster
2. background noise: Collins English Dictionary
3. background noise: Vocabulary.com
4. background noise: Dictionary.com
5. Background noise: Wikipedia, the Free Encyclopedia
6. background noise: Rhymezone
7. background noise: FreeDictionary.org
8. background noise: Mnemonic Dictionary
9. background noise: TheFreeDictionary.com
10. background noise: Merriam-Webster
11. background noise: Wiktionary

Computing (2 matching dictionaries)

12. background noise: CCI Computer
13. background noise: Encyclopedia

Science (2 matching dictionaries)

14. Environmental Terminology Discovery Service (No longer online)
15. Background Noise: Extragalactic Astronomy

Slang (1 matching dictionary)

16. background noise: Urban Dictionary

Tech (4 matching dictionaries)

17. AUTOMOTIVE TERMS (No longer online)
18. BACKGROUND NOISE: NOISE CONTROL TERMS
19. Background noise: Data Acquisition
20. BACKGROUND NOISE: Power Engineering

(Note: See background_noises as well.)

Definitions from Wiktionary (background noise) ▸ noun:  Any sound other than the sound being monitored (the primary sound); a form of noise pollution or interference. Opposite: foreground, silence, quiet, stillness Phrases: background noise of voices, background noise made by people, more... ▸ Words similar to background noise ▸ Usage examples for background noise ▸ Idioms related to background noise ▸ Wikipedia articles (New!) ▸ Words that often appear near background noise ▸ Rhymes of background noise ▸ Invented words related to background noise