Mark Hammer

Here is a decent and provocative book I can recommend on the topic: http://www.amazon.com/Enabling-Knowledge-Creation-Mystery-Innovation/dp/0195126165

It's been a couple of years since I read it, so I forget whether they actually define "innovation", but their principal focus is on creating the hospitable conditions for innovation. It can include things as seemingly trivial as lunchroom location/design.

If they DO have some tacit definition of organizational innovation, it would likely be some sort of change that comes about via knowledge-sharing and "silo-busting".