Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “extension”

See all translations

extension

noun uk   /ɪkˈsten.ʃən/ us  

extension noun (REACH)

B2 [C or U] the fact of reaching, stretching, or continuing; the act of adding to something in order to make it bigger or longer: Martin Luther King, Jr, campaigned for the extension of civil rights to (= for them to include) black people. The extension (= increasing) of police powers in the province has been heavily criticized. His report contained serious criticisms of the finance director, and, by extension (= therefore), of the entire board of management. The article is an extension of (= takes )further the ideas Professor Fox developed in an earlier book. I've applied for an extension to my visa (= asked for it to last longer). They are hoping to get an extension of their loan (= to be given a longer period of time in which to pay it back).
More examples

extension noun (BUILDING)

[C] UK ( US addition) a new part added to a house or other building: We're building an extension to/on our house.

extension noun (PHONE)

B2 [C] any of two or more phones in the same house that share the same number, or any of a number of phones connected to a switchboard in a large building such as an office: We have an extension in our bedroom. When you call, ask for extension 3276.

extension noun (COMPUTER)

[C] the last part of the name of a computer file, which comes after a (.), and shows what type of file it is

extension

adjective [only before noun] uk   /ɪkˈsten.ʃən/ us  
intended to support students' learning by making them try different or more difficult things in addition to their basic work: The book includes lesson plans and extension activities. US ( UK extramural) organized by a college or university, etc. for students who are not able to be physically present in class: extension classes/courses
(Definition of extension from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of extension?
Add Cambridge dictionaries to your browser to your website

Definitions of “extension” in other dictionaries

Word of the Day

shampoo

a liquid used for washing hair, or for washing particular objects or materials

Word of the Day

The way we move (Verbs for walking and running)

by Kate Woodford,
March 25, 2015
​​​ This week we’re looking at interesting ways to describe the way that people move. Most of the verbs that we’ll be considering describe how fast or slow people move. Others describe the attitude or state of mind of the person walking or running. Some describe both. Starting with verbs for walking slowly,

Read More 

crossfit noun

March 23, 2015
high-intensity strength training Two women in strappy dresses discussed how much weight they could snatch

Read More