“If you yourself have used the word without being exactly sure what it means, you are in good company. One of Kuhn’s critics (he had many) claimed to have isolated 22 distinct meanings for paradigm in the book, and Kuhn confessed to a certain elasticity in his use of the term. Nonetheless, it is a genuine and powerful notion, its presence in our language well deserved.”
http://www.nytimes.com/1996/12/29/magazine/the-paradigm-shifts.html