GURPS: Church and State Glossary
Arch Prior: Elected by and from the Curia to lead the Church for a term of life. Can be impeached.
Ascendant: A mortal who has ascended to a higher state of being; often becoming one of the archetypes in the four houses of the gods, but sometimes a lone unaligned actor.
Curia: Council of church leaders who set Cannon law, interpret doctrine, appoint bishops, archbishops, and elect the Arch Prior of the Church
Methuselah: A mortal who has dramatically extended his life through magic or divine intervention. (At least four spells or elixirs allow this, and a mage of Talent often turns his endeavors to pursuing this in their later years.)
Talent: A person of significant magical talent (magery or imbuement level 3, or other significant talent)
Traditions: Seven schools of thought to pursuing magic. Thaumotology must specialize in a given tradition. The traditions mark the magical theory as that tradition understands it. (see GURPS: Church and State Magic