We found 6 dictionaries that define the word back numbers:

General (5 matching dictionaries)

1. back numbers: Merriam-Webster
2. back numbers: Collins English Dictionary
3. back numbers: Wiktionary
4. Back Numbers: Wikipedia, the Free Encyclopedia
5. back numbers: TheFreeDictionary.com

Art (1 matching dictionary)

6. Glossary of Stamp Collecting Terms (No longer online)

Definitions from Wikipedia (Back Numbers) ▸ noun:  the second album by Dean & Britta, released in 2007. ▸ Words similar to back numbers ▸ Usage examples for back numbers ▸ Idioms related to back numbers ▸ Wikipedia articles (New!) ▸ Words that often appear near back numbers ▸ Rhymes of back numbers ▸ Invented words related to back numbers