extension Meaning in the Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of “extension” in the English Dictionary

"extension" in British English

See all translations


uk   us   /ɪkˈsten.ʃən/

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 ofcivilrights to (= for them to ​include)blackpeople. The extension (= ​increasing) ofpolicepowers in the ​province has been ​heavilycriticized. His ​reportcontainedseriouscriticisms of the ​financedirector, and, by extension (= ​therefore), of the ​entireboard of ​management. The ​article is an extension of (= ​takesfurther) the ​ideas Professor Fox ​developed in an ​earlierbook. I've ​applied for an extension to my ​visa (= ​asked for it to last ​longer). They are ​hoping to get an extension oftheirloan (= to be given a ​longerperiod of ​time in which to ​pay it back).
More examples

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 ​phonesconnected to a switchboard in a ​largebuilding such as an ​office: We have an extension in ​ourbedroom. When you ​call, ​ask for extension 3276.

extension noun (COMPUTER)

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

extension noun (HAIR)

(also hair extension) [C usually plural] a ​longpiece of ​hair that is ​added to a person's own ​hair in ​order to make the ​hairlonger

extension noun (BUILDING)

[C] UK (US addition) a new ​partadded to a ​house or other ​building: We're ​building an extension to/onourhouse.

extensionadjective [only before noun]

uk   us   /ɪkˈsten.ʃən/
intended to ​supportstudents' ​learning by making them ​try different or more ​difficult things in addition to ​theirbasicwork: The ​bookincludeslessonplans and extension activities. US (UK extramural) offered by a ​university to ​people who are not ​studying for a ​degree there : extension classes/​courses
(Definition of extension from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"extension" in American English

See all translations


 us   /ɪkˈsten·ʃən/

extension noun (PHONE)

[C] (abbreviation ext.) any of two or more ​telephones in the same ​house that ​share the same ​number: We have an extension in ​ourbedroom. [C] (abbreviation ext.) An extension is also any of the ​telephonesconnected to a ​centralsystem, esp. in a ​business.

extension noun (ADDITION)

[C/U] an ​amount by which something is ​increased, or something ​added to something ​else: a ​contract extension I ​applied for an extension to my ​visa. [C] We’re ​building an extension on ​ourhouse to ​enlarge the ​kitchen.
(Definition of extension from the Cambridge Academic Content Dictionary © Cambridge University Press)

"extension" in Business English

See all translations


uk   us   /ɪkˈstenʃən/
[C or U] an ​increase in the ​period of ​time during which something is ​effective: grant/offer/receive an extension When it ​failed to ​meet the ​deadline, the ​company was ​granted an extension. a three-month/two-year, etc. extensionextension to sth The ​company has ​negotiated an extension to the ​deadline for its £275 million cash-and-paper ​offer, originally expected tomorrow.
[C or U] the fact of giving or ​offering something to someone: This ​cheap, ​availablemoneyled to the extension of ​credit around the ​world.
[C] ( abbreviation ext., abbreviation xtn) COMMUNICATIONS one of the ​phones in a large ​building that have their own ​numbers and are ​connected to a switchboard (= a ​piece of ​equipment used to ​direct all ​phonecalls): Please give me a ​call back at extension 1247. Can you put me through to ​Jan Robert's extension, please?
[C or U] an ​increase in the ​size or ​range of something: Most ​banks are ​recognizing that ​customers view ​Internetbanking as an extension of existing ​services. We are ​committed to the extension of this ​taxcredit to ​cover all children born after April 2010. The ​engineers have begun ​working on an extension of the canal.
[C] IT the last ​part of the ​name of a ​computerfile, which comes after a dot (.), and ​shows what ​type of ​file it is: Be sure to ​leave the file extension unchanged.
[C] UK ( US addition) a new ​part that is ​added onto a ​building: The ​banksyndicate will ​finance a $460 million extension to the ​carfactory.
(Definition of extension from the Cambridge Business English Dictionary © Cambridge University Press)
What is the pronunciation of extension?
Add Cambridge dictionaries to your browser to your website

“extension” in Business English

Word of the Day


to go from place to place searching, especially for food

Word of the Day

Meerkat meme
Meerkat meme
by Colin McIntosh,
September 03, 2015
Meerkats are not new to popular culture (they appear in the folk tales of the San people of the Kalahari), but their arrival in the public’s consciousness, at least in the UK and the US, is a relatively recent phenomenon. Meerkats are small, sociable Southern African mammals that live in large family

Read More 

parklet noun
parklet noun
August 31, 2015
a public outdoor space that may be associated with a local business but where anyone can sit Pop-up cafes in NY are what’s actually called parklets in many other places around the country.

Read More