American Dictionary

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Definition extension in American English

extension noun

noun
/ɪkˈstenʃ(ə)n/
1

extra time that you are given to finish a piece of work, especially at college

Example

I'm going to ask for an extension on this paper.

Synonyms and related words
1.1

extra time that you are given to pay money that you owe

Example

Will the bank give you an extension on the loan?

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1.2

extra time that you are given to use a particular legal document or right

Example

a visa extension

Example

Brady wants a two-year extension to his contract.

2

a telephone line that is one of several lines coming from a main line

Example

What's your extension?

Example

I'm at extension 334.

Example

a new extension number

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3

an extra room or rooms added to a building

Example

The company is building an extension onto the side of the factory.

Example

He has applied for permission to build a single-story extension to his house.

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3.1

a part of a road or railroad line added to the existing one

Example

a proposed freeway extension

4

something that you add to a long thin object to make it able to reach somewhere

Example

This cord isn't long enough - do you have an extension?

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4.1

long pieces of artificial hair that can be fastened to someone's hair to make it look longer

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5

something that develops from a particular custom, activity, idea, etc.

Example

Business entertainment seems a natural extension of Japan's gift-giving culture.

Example

He sees local history as an extension of family history.

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6

the action of stretching part of your body

Example

His leg was now capable of full extension.

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7

an increase in the power of something

Example

the further extension of state control

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8

a set of courses provided by a college for people who are not able to go to classes at the college itself or are not able to go during the normal class times

9

the last part of the name of a computer file. For example, "exe" and "doc" are extensions.

Synonyms and related words
Definition extension in American English