People [with goal] <--> interaction <--> interface [of object's function/features].
I was about to say that the problem with trying to find a single definition is that it will necessarily have too many clear boundaries. Really it's a continuum, and I think Jarod's example there is pretty good. Continuum's allow for overlap and how you interpret anything on it depends on where you are standing on it.
I'm saying this, by the way, as someone writing their PhD on interactivity and trying to find and build definitions in it. Sigh. I don't particularly agree that someone needs a goal to drive the interaction, not an explicit one at least. A lot of what I've written about and done in the past has been about play and playful discovery in interaction, both in an arts context as well as an approach to interaction design. Play is much more open and not necessarily goal- based (and when it is, it's a game instead).
Much as I would like to be able to explain to my mum what I've done for the last 15 years, I think we're still a way off something as clear as "a carpenter".
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