Oddly enough, it's the gravy that isn't supposed to have meat in it! Some colleagues I eat lunch with look at my spaghetti with meat sauce (it's got hamburger in it) with a jaundiced eye, calling it barbaric.They insist on marinara made only from tomatoes, which they call "gravy."
I just call it delicious and tuck in.
The term "gravy" must be regional. I grew up around Italians and never heard the term and many of them tell me the same. Only thing I can figure is some call it "gravy" and others don't. Interesting.
I keep my 2 feet on the ground, and my head in the twilight zone.