The act of extending; a stretching out; enlargement in length, breadth, or time; an increase / The state of being extended

plural of extension

(logic) Used to connect the internal logic of two statements. / (linguistics, semantics) In the broad sense; broadly / (linguistics) figuratively, metaphorically

Having a great extent; covering a large area; vast. / (figuratively) Considerable in amount. / Serving to extend or lengthen; characterized by extension.

Capable of being extended.

In an extensive manner, widely. / To a great extent.

The capability of being extended / (computing) A quality of design that takes possible future advances into consideration and attempts to accommodate them

The degree or property of being extensive.

plural of extensiveness

(obsolete) extent; expanse