That was not an easy one to find! I only got it because of the subject being recently treated on the "In Our Time" podcast. So thanks to Melvyn Bragg and his guests.
The next round is now starting, hold on to the straps. The sentient baton suggests ABSTRACT.

P-precedent? No, but don't let that put you off.

Made up? Not fictional.

Fun physics? No.
Fun life? No, although humans have and have had a great interest in the AOTC. It's not an occupation, either.
Earthbound? So far as anyone knows, only on Earth.