ex·ten·si·ble 
(ĭk-stĕnsə-bəl)
(ĭk-stĕnsə-bəl)adj.
1. Capable of being extended or protruded: an extensible tongue; extensible tables.
2. Computers Of or relating to a programming language or a system that can be modified by changing or adding features.
ex·ten′si·bili·ty n.