Indeed - I simplified for the sake of saving myself having to type more, but you're right that it is important to understand what poly means when you are either telling someone you are poly or hearing it from a partner. Definitions are key.
And now since we're back on the subject of communication, I'm going to switch gears just slightly and throw out another one of my pet communication peeves: "don't ask don't tell." I've played with that one before and it's always something that seems like a good idea at the time but always ends up biting someone in the proverbial ass.
Thoughts?