Price (read: exclusivity) and impracticality are what define a supercar. Generally it must also hold some sort of record for its era.. whether its price, top speed, or 0-60.. the term 'supercar' to me is like the term beautiful.. its sort of in the eye of the beholder. But most people would probably define it as any sports car thats over 200k and has a limited production (likely due to limited interested, not the manufacturers producing them in limited batches).
A guy in my neighborhood has a CCXR.. that to me is a Supercar.. and I do not consider my E46 M3 even close to being in the same league as that car.
Last edited by MarcusLSB; 10-01-2012 at 12:09 AM.