Able to be extended; extendable:an extensible architecture designed to accommodate changes...
However, software-based protection can allow for more extensible security models, with potentially significant performance improvements over traditional hardware-based solutions.
This is far from the only extensible platform out there and everybody has their personal pet peeves with the code base.
Derivatives
extensibility
/ɪkstɛnsɪˈbɪlɪti //ɛkstɛnsɪˈbɪlɪti /noun...
New systems will bring additional improvements in these areas, but the revolution happens in the extensibility domain.
If you don't plan for extensibility when you're designing version 1.0 of your language, you often don't get any.