telephone extension

1. 1.

   an additional telephone set that is connected to the same telephone line

   Synonymsextensionextension phone

   Broadertelephone

Questions about telephone extension

What does telephone extension mean?

telephone extension means "an additional telephone set that is connected to the same telephone line".

What is another word for telephone extension?

Close synonyms include extension, extension phone. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is telephone extension a common word?

telephone extension is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.