It's beautiful!
To me, a "quilt" as in the first definition given above indicates...that it is usually a covering related to a bed.
We have quilted purses, potholders, and such, but no one I that I know of calls them "quilts". They call them what they are. Depending on the size of your quilt, I'd call it a wallhanging, or as someone suggested, a "work of art" that you quilted.
But that's just me. I've seen people advertise on ebay a "quilt" and then I look closely and it's about 12-15" square. (The pics were taken in such a way it was hard to tell the size by the picture alone--had to read carefully to see the size)
I am not sure the issue will ever be resolved once and for all. ;)