extension
US /ɪkˈstɛnʃən/
・UK /ɪkˈstenʃn/
B1
noun
- Addition to something, e.g. a house
- Suffix code of a computer file, e.g. .pdf, .jpg
- Telephone for individual person, e.g. In an office
- Something added to the end of something
- Extra time allowed to complete something
adjective
- Adding extra length