[RussP]

Your post does not say that that the word “theory” does not derive from “theo” or “God.” What is your source?

Also, what does “L.L. theoria (Jerome)” mean?

[ndt]

"What is your source?"

I'm using Etymology Online

"Also, what does “L.L. theoria (Jerome)” mean?"

I think that L.L. is Late Latin and theoria being the word in Latin and Jerome a reference to another source, but double check the key at the website to be sure.

[ndt]

I just double checked. L.L. is "Late Latin, the literary Latin language as spoken and written c.300-c.700."