The narrow definition of open API: specification of function-call conventions that defines an interface to a service. Yeah, that didn't help me, either. But, in the great Silicon Valley tradition of techspeak applied to live human beings, here's another use for the term. There is a certain internet company CEO, married, but with a succession of very public girlfriends. Well, said a wag at the Web 2.0 conference last week, sure he has women on the side. After all, he does have an open API.