the GNU version of the Collaborative International Dictionary of English
adj. Capable of being extended, whether in length or breadth; susceptible of enlargement; extensible; extendible; -- the opposite of contractible or compressible.
The Century Dictionary and Cyclopedia
Capable of being extended; admitting of being stretched in length or breadth; susceptible of enlargement or expansion.
In zoology, capable of being thrust out; extensile; protrusile.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. capable of being protruded or stretched or opened out
Word Usage
""The software is extensible, that is what I like," he says."