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English definition of “extension”

extension

noun [C]
 
 
/ɪkˈstenʃən/
PART OF A BUILDING a new room or rooms that are added to a building: You could build an extension onto the back of the house.Parts of buildings in general
EXTRA TIME B2 extra time that you are given to do or use something: You might be able to get an extension on your visa.Delaying and wasting time
TELEPHONE B2 a telephone that is connected to the main telephone in an office or other large building: Call me on extension 213.Telephone equipment
(Definition of extension from the Cambridge Learners Dictionary © Cambridge University Press)
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