[uncountable, countable] extension (of something) the act of increasing the area of activity, group of people, etc. that is affected by something.

the act of increasing the area of activity, group of people, etc. that is affected by something; the extension of new technology into developing countries.

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[transitive] extend something to make something longer or larger. to extend a fence/road/house; There are plans to extend the children's play area.

There are 27 meanings listed in OED's entry for the noun extension, eight of which are labelled obsolete. See 'Meaning & use' for definitions, usage, ...

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[only before noun] ​long or longer than usual or expected. an extended lunch hour.

To stretch or continue for a specified distance; to reach, be continuous, to or towards a certain point of space or time. 1481. Thens departeth ...

extend ; 1 · to make something longer or larger to extend a fence/road ; 2 · to make something last longer to extend a deadline/visa The show has been extended for ...

n. 1. the act of extending or stretching, especially the muscular movement by which a limb is straightened. 2. the application of traction to a fractured or ...