extensible

Concise Oxford English Dictionary © 2008 Oxford University Press:
extend/ɪkˈstend/

▶verb

• 1 make larger or longer in space or time.

  ■ occupy a specified area or continue for a specified distance.

• 2 hold (something) out towards someone.

  ■ offer or make available.

• 3 (extend to) be applicable to.

• 4 strain or exert to the utmost.

– derivatives
extendability noun,
extendable adjective,
extendibility noun,
extendible adjective,
extensibility noun,
extensible adjective.

– origin ME: from L. extens-, extendere ‘stretch out’.