Casado noted that the term SDN was coined in 2009, and at the time, it did mean something fairly specific.

“Now it is just being used as a general term for networking, like all networking is SDN,” Casado said. “SDN is now just an umbrella term for cool stuff in networking.”

via OpenFlow Inventor Martin Casado on SDN, VMware and Software Defined Networking Hype [VIDEO].

I wondered this after seeing almost every other article in networking blogs like Light Reading with SDN in the title.  Click out the sdn tag to see all that made it here.