Ruach

The English word spirit, from Latin spiritus "breath", has many different meanings and connotations, most of them relating to a non-corporeal substance contrasted with the material body. It can also refer to a "subtle" as opposed to "gross" material substance, as in the famous last paragraph of Sir Isaac Newton's Principia Mathematica.

The word spirit is often used metaphysically to refer to the consciousness or personality. The notions of a person's spirit and soul often also overlap, as both contrast with body and both are believed to survive bodily death in some religions, and "spirit" can also have the sense of "ghost", i.e. a manifestation of the spirit of a deceased person.

The term may also refer to any incorporeal or immaterial being, such as demons or deities. In the Bible, "the Spirit" (with a capital "S"), specifically denotes the Holy Spirit.

The English word "spirit" comes from the Latin spiritus, meaning "breath", but also "spirit, soul, courage, vigor", ultimately from a Proto-Indo-European *(s)peis. It is distinguished from Latin anima, "soul" (which nonetheless also derives from an Indo-European root meaning "to breathe", earliest form *h₂enh₁-). In Greek, this distinction exists between pneuma (πνεῦμα), "breath, motile air, spirit," and psykhē (ψυχή), "soul" (even though the latter term, ψῡχή = psykhē/psūkhē, is also from an Indo-European root meaning "to breathe": *bhes-, zero grade *bhs- devoicing in proto-Greek to *phs-, resulting in historical-period Greek ps- in psūkhein, "to breathe", whence psūkhē, "spirit", "soul").

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