We found 8 dictionaries that define the word telephone extension:

General (7 matching dictionaries)

1. telephone extension: Vocabulary.com
2. telephone extension: Dictionary.com
3. Telephone extension: Wikipedia, the Free Encyclopedia
4. telephone extension: Rhymezone
5. telephone extension: FreeDictionary.org
6. telephone extension: Mnemonic Dictionary
7. telephone extension: TheFreeDictionary.com

Computing (1 matching dictionary)

8. telephone extension: Encyclopedia

(Note: See telephone_extensions as well.)

Definitions from WordNet (telephone extension) ▸ noun:  an additional telephone set that is connected to the same telephone line ▸ Words similar to telephone extension ▸ Usage examples for telephone extension ▸ Idioms related to telephone extension ▸ Wikipedia articles (New!) ▸ Words that often appear near telephone extension ▸ Rhymes of telephone extension ▸ Invented words related to telephone extension