We found 22 dictionaries that define the word peer group:

General (17 matching dictionaries)

1. peer group: Longman Dictionary of Contemporary English
2. peer group: Oxford Learner's Dictionaries
3. peer group: Collins English Dictionary
4. peer group: Vocabulary.com
5. peer-group: Wordnik
6. peer group: Cambridge Advanced Learner's Dictionary
7. peer group: Wiktionary
8. peer group: The Wordsmyth English Dictionary-Thesaurus
9. peer group: Infoplease Dictionary
10. peer group: Dictionary.com
11. Peer group (computer networking), Peer group: Wikipedia, the Free Encyclopedia
12. peer group: Rhymezone
13. peer group: FreeDictionary.org
14. peer group: Mnemonic Dictionary
15. peer group: TheFreeDictionary.com

Business (1 matching dictionary)

16. BusinessDictionary.com (No longer online)

Medicine (2 matching dictionaries)

17. Medical Dictionary (No longer online)
18. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

19. Sociology (No longer online)

Science (1 matching dictionary)

20. peer group: Anthropological Terms

(Note: See peer_groups as well.)

Definitions from Wiktionary (peer group) ▸ noun:  a group of people who are approximately the same age and status, especially if they have the same interests Similar: peer, order, posse, fellow, age-mate, circle of friends, circle, groupmate, cohort, coeval, more... Types: clique, crowd, set, gang, posse, in-crowd, out-group, more... Phrases: person not accepted by his peer group, more... ▸ Words similar to peer group ▸ Usage examples for peer group ▸ Idioms related to peer group ▸ Wikipedia articles (New!) ▸ Words that often appear near peer group ▸ Rhymes of peer group ▸ Invented words related to peer group