I bake a lot of pies. its a baked dish with a pastry botton usually filled with fruit or other ingredients
I generally like pies.  When I was a boy, I didn't care for them, but as I have aged, I have acquired a more mature taste.  I like apple pie and pecan.
You define a pie by its crust
That is very interesting.  Do you know anything about the various crusts of pie?
Well a "top crust" has the fruit or filling underneath it
Is a dish like chicken pot pie actually classified as a pie?
Yes.A two crust pie has has filling in the middle and its enclosed in pastry
A two crust pie?  Hmm.  Is there such a thing as a one crust pie?  
Yes a single crust or bottom crust pie (usually filled) is a one crust pie