Is there a clear definition of what "Integrated" means?

A preamplifier (passive or active) and amplifier in the same box.  All the rest are just options. 

I was always under the impression that all a unit had to have to be integrated was an input stage and an amplification (output) stage and thus would include a volume control pot.  But I could be wrong--I often am. 

Oops--I just cross posted with @soix  .  Yes, that's what I always thought.

@soix but what constitutes the "pre-amp"? Any kind of driver or input stage that increases the signal before the output amplification? And a variable resistor which modulates the grid of the input stage ie volume control pot. ?