Canonum De Lex Ecclesium
Canons of Ecclesiastical Law
II. Supernatural
2.2 Supernatural Entity
Article 39 - Spirit
Canon 3702 (link)
A spirit is a term used to generically define an independent supernatural force less than a god. Hence, spirit may be applied to mean the undying essence of a human being, equivalent to the concept of soul. Spirit may also be applied to mean a ghost, angel, demon or some other entity.
Canon 3703 (link)
In accordance with these canons and the most sacred Covenant Pactum De Singularis Caelum, all Spirits pledge their allegiance to One Heaven and no other.