The term "aseity" is used to describe an assumed deity to which the description "ultimate being" is supposed to apply. This term originates in the Judaeo-Christian tradition. The assumed deity is said to ‘possess’ aseity, since it is not supposed to have been created, but rather thought to have always existed, and be necessarily existent.
Whether or not this being should be described as God turns on whether the label 'Creator' is a rigid designator of God. Given that most theists understand all that is not God to be brought about by God, and that many (for example, Aquinas) argue from the non-aseity of the universe to the existence of God, this problem is somewhat theoretical.
Some claim that the universe should be described as having aseity.
Aseity has also been criticized as being logically incoherent with the concept of god as a being or god as existing. Furthermore, it can be argued that for the notion of aseity not to be logically circular or inconsistent, the supposed entity to which it applies would have to be identified with its properties, instead of instantiating, exemplifying or having its properties. This, however, seems to contradict the notion that god is a person or a causal agent, for what person or agent can also be a property (or complex of properties)?