Hey,
A lot of the definitions are in the REG. Priest, Prophet, Spiritual Gift, and Earthly Battle all have definitions preceding the lists in the Glossary of Terms of the REG. Others like "judge" "high priest" and "Greek" don't have a definition. Perhaps when we wrote those lists the definitions seemed obvious enough that it didn't need to be included or perhaps we just left them out. It is definitely something we should add in future revisions.
Tschow,
Tim "Sir Nobody" Maly