From Longman Dictionary of Contemporary Englishextensionex‧ten‧sion /ɪkˈstenʃən/ ●●○ S3 W3 noun 🔊 🔊 1 making something bigger or longer [countable, uncountable]BIG the process of making a road, building etc bigger or longer, or the part that is addedextension of 🔊 the extension of the Jubilee underground line2 extra rooms [countable] British EnglishTBBBIG another room or rooms which are added to a buildingextension to 🔊 the planned extension to the National Museum 🔊 a loft extension3 extra time [countable usually singular]TIME/HOW LONG an additional period of time allowed for something 🔊 Donald’s been given an extension to finish his thesis. 🔊 The pub’s got an extension tonight (=it will stay open longer than usual).4 include/affect more than before [singular, uncountable]EFFECT/INFLUENCE the development of something in order to make it affect more people, situations, areas than beforeextension of 🔊 the extension of the copyright laws to cover online materials 🔊 an extension of the powers of the European Parliament5 telephone [countable] a) TCTone of many telephone lines connected to a central system in a large building, which all have different numbers 🔊 Can I have extension 316, please? 🔊 Do you know Mr Brown’s extension number? b) TCTone of the telephones in a house that all have the same number6 → by extension7 → extensions8 computer [countable] technical a set of three letters that follow the name of a computer file to show what it is. For example, the extension ‘.doc’ shows that a file is a written document.9 electric wire [countable] British English an extension lead10 stretch arm/leg [countable, uncountable] the position of a part of the body when it is stretched, or the process of stretching it11 university/college [uncountable]SEC part of a university or college that offers courses to people who are not full-time students
Examples from the Corpusextension• The city is building an extension to the subway line.• A parser is an extension of a recogniser which assigns grammatical structure to the input.• It is just an extension of on-the-road campaigning.• an extension course• Two of the 16-bit slots have local bus extensions.• Some 24,000 more tickets will be made available by phone or in person for the three-day extension.• The system will also support message passing models such as parallel virtual machine and the high performance Fortran extensions of Fortran 90.• "I've been having some problems getting extension, " Clark said about his elbow.• Hello, I'd like extension 2807, please.• The twelve sales units in the London office were merely extensions of the New York parent operations.• You'll find the Picasso collection in the extension to the museum.• The extension to Inch Abbey has been approved completely but only part of the Ballyduggan extension has received approval.• the extension of credit to newer customers• Professor Lohman gave me a one-week extension on my paper.extension of• What is needed is an extension of copyright laws to cover on-line materials.extension number• He turned back to his desk, picked up the phone and jabbed an extension number.• He was already reaching for his phone, jabbing an extension number.• This can be achieved by dialling: followed by the four digit extension number.