Definition from macmillandictionary.com
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We are building an extension on the back of our house.
He has applied for permission to build a single-storey extension to his house.
a proposed motorway extension
What’s your extension?
I’m on extension 334.
a new extension number
I’m going to ask for an extension on this essay.
Will the bank give you an extension on the loan?
a visa extension
Brady wants a two-year extension to his contract.
There was a bar extension until midnight.
Local shops have been granted an extension to opening hours.
This lead isn’t long enough – do you have an extension?
Business entertainment seems a natural extension of Japan’s gift-giving culture.
He sees local history as an extension of family history.
His leg was now capable of full extension.
the further extension of state control
courses provided through university extension