Intrapreneur is a person who focuses on innovation and creativity and who transforms a dream or an idea into a profitable venture, by operating within the organizational environment. Thus, Intrapreneurs are Inside entrepreneurs… (Wikipedia via Scott Gatz)
Wikipedia entries here and here. According to ‘pedia, the term dates to 1985 and a book by Gifford Pinchot called Intrapreneuring. (A revised edition, Intrapreneurship in Action, copyright 1999, is still in print.)
Ross Mayfield comments here.