extension

The most direct or specific meaning of a word or expression; the class of objects that an expression refers to.

“the extension of `satellite of Mars' is the set containing only Demos and Phobos”

Act of stretching or straightening out a flexed limb.

A mutually agreed delay in the date set for the completion of a job or payment of a debt.

“they applied for an extension of the loan”

The ability to raise the working leg high in the air.

“the dancer was praised for her uncanny extension”

“good extension comes from a combination of training and native ability”

An addition that extends a main building.

Amount or degree or range to which something extends.

“the wire has an extension of 50 feet”

An addition to the length of something.

The spreading of something (a belief or practice) into new regions.

An additional telephone set that is connected to the same telephone line.

An educational opportunity provided by colleges and universities to people who are not enrolled as regular students.

A string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename.

“most applications provide extensions for the files they create”

“most BASIC files use the filename extension .BAS”

Act of expanding in scope; making more widely available.

“extension of the program to all in need”