Term: Ability Rank
Every Ability, namely Spells, have an associated rank tied to it, being its bare minimum strength. Almost every ability can be Augmented to have a different power as the needs and resources demand, but typically the larger a spell's rank is, the more powerful it starts off as.
An ability's rank indicates its overall power, from 1 to 10. Some abilities exist that scope, with those being able to alter reality, or shut down or subsume the powers of Divine Beings.