We found 8 dictionaries that define the word junk e-mail:

General (7 matching dictionaries)

1. junk e-mail: Merriam-Webster
2. junk e-mail: Vocabulary.com
3. junk e-mail: Dictionary.com
4. junk e-mail: Rhymezone
5. junk e-mail: FreeDictionary.org
6. junk e-mail: Mnemonic Dictionary
7. junk e-mail: TheFreeDictionary.com

Computing (1 matching dictionary)

8. junk e-mail: Encyclopedia

(Note: See junk_e-mails as well.)

Definitions from WordNet (junk e-mail) ▸ noun:  unwanted e-mail (usually of a commercial nature sent out in bulk) ▸ Words similar to junk e-mail ▸ Usage examples for junk e-mail ▸ Idioms related to junk e-mail ▸ Wikipedia articles (New!) ▸ Words that often appear near junk e-mail ▸ Rhymes of junk e-mail ▸ Invented words related to junk e-mail