What is "Natural Childbirth"?

Hi, this is a bit of a vent post but really I am interested in your kind comments, and perspective.
I've had 2 Homebirths (obviously unmedicated). I am extremely proud of myself that I've had "natural childbirths". It does bother me though when people use the term "natural childbirth" when they actually should say "medicated vaginal birth". Or they say they had a "natural childbirth" because they didn't get an epidural but they still had other meds and intervention such as cytotech, pitocin or pain relievers like Demerol. Here's my favorite, it was a natural childbirth because "my epidural wore off, didn't work, or I got it at 8cm"
I don't believe that all of these scenarios should be classified as natural childbirth. 
Or am I the one using the wrong terminology? 
Why does it matter to me? I dunno, it just does.
What do you think?

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