Extensible

a.

1.

Capable of being extended, whether in length or breadth; susceptible of enlargement; extensible; extendible; - the opposite of contractible or compressible.

Adj.

1.

extensible - capable of being protruded or stretched or opened out; "an extensile tongue"; "an extensible measuring rule" Synonyms: extensile

(programming)

extensible - Said of a system (e.g., program, file format, programming language, protocol, etc.) designed to easily allow the addition of new features at a later date, e.g. through the use of hooks, an API or plug-ins. See also extend, forward compatible.

extensile