We found 21 dictionaries that define the word levels:

General (12 matching dictionaries)

1. levels: Merriam-Webster
2. levels: Oxford Learner's Dictionaries
3. levels: Collins English Dictionary
4. levels: Vocabulary.com
5. Level's, Levels, level's, levels: Wordnik
6. levels: Cambridge Advanced Learner's Dictionary
7. levels: Wiktionary
8. levels: Dictionary.com
9. levels: Cambridge Essential American English Dictionary
10. Levels (Avicii song), Levels (Bilal song), Levels (Meek Mill song), Levels (Nick Jonas song), Levels (album), Levels, The Levels: Wikipedia, the Free Encyclopedia
11. Levels: Rhymezone
12. levels: TheFreeDictionary.com

Business (2 matching dictionaries)

13. levels: Legal dictionary
14. levels: Financial dictionary

Computing (1 matching dictionary)

15. levels: Encyclopedia

Medicine (2 matching dictionaries)

16. levels: Merriam-Webster Medical Dictionary
17. levels: Medical dictionary

Miscellaneous (1 matching dictionary)

18. levels: Idioms

Slang (1 matching dictionary)

19. levels: Urban Dictionary

Tech (2 matching dictionaries)

20. AUTOMOTIVE TERMS (No longer online)
21. Rane Professional Audio Reference (No longer online)

(Note: See level as well.)

Definitions from WordNet (Levels) ▸ name:  A surname (very rare: popularity rank in the U.S.: #33393) Opposite: uneven, rough, irregular, imbalanced, skewed Types: levels of analysis, more... Phrases: energy levels, price levels, water levels, sea levels, trophic levels, more... Adjectives: high, different, low, various, normal, several, elevated, national, upper, educational, multiple ▸ Words similar to levels ▸ Usage examples for levels ▸ Idioms related to levels ▸ Wikipedia articles (New!) ▸ Words that often appear near levels ▸ Rhymes of levels ▸ Invented words related to levels