/ ɪkˈstenʃn; NAmE / noun
[ U , C ] extension (of sth) the act of increasing the area of activity, group of people, etc. that is affected by sth :
the extension of new technology into developing countries
a gradual extension of the powers of central government
The bank plans various extensions to its credit facilities.
[ C ] extension (to sth) ( BrE ) ( NAmE add·ition ) a new room or rooms that are added to a house
[ C ] a new part that is added to a building :
a planned two-storey extension to the hospital
[ C ] extension (of sth) an extra period of time allowed for sth :
He's been granted an extension of the contract for another year.
a visa extension
( BrE )
The pub had an extension (= was allowed to stay open longer) on Christmas Eve.
[ C ] ( abbr. ext. ) an extra telephone line connected to a central telephone in a house or to a switchboard in a large building. In a large building, each extension usually has its own number :
We have an extension in the bedroom.
What's your extension number?
Can I have extension 4332 please?
MAKING STH LONGER / LARGER
[ U , C ] the act of making sth longer or larger; the thing that is made longer and larger :
The extension of the subway will take several months.
extensions to the original railway track
hair extensions (= pieces of artificial hair that are added to your hair to make it longer)
COLLEGE / UNIVERSITY
[ C ] a part of a college or university that offers courses to students who are not studying full-time ; a programme of study for these students :
La Salle Extension University
the set of three letters that are placed after a dot at the end of the name of a file and that show what type of file it is
[ C ] ( BrE ) = extension lead
- by extension
late Middle English : from late Latin extensio(n-) , from extendere stretch out, from ex- out + tendere stretch.