Canonum De Lex Ecclesium
Canons of Ecclesiastical Law

one heaven iconII.   Supernatural

2.2 Supernatural Entity

Article 39 - Spirit

Canon 3702 (link)

Spirit is a term used to generically define an independent supernatural force not constrained by the rules of temporal form – hence a level consciousness no longer bound to a body or other temporal limitation. The term “spirit” therefore may be accurately applied in general terms to describing the undying essence of a human being, or an angel or demon or some other entity not bound to temporal limitation. However, the term “spirit” cannot be reliably used to describe a ghost or soul as both terms imply a consciousness no longer bound to a body but still bound to significant temporal limitations.

Canon 3703 (link)

The word Spirit comes directly from the Latin term spiritus meaning “breath, breathing, breeze, air; inspiration; character or courage” from the Latin root word spiro meaning “to breathe, blow; to be alive; to be inspired”.