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A spirit is a supernatural being, often but not exclusively a non-physical entity; such as a ghost, fairy, or angel. The concepts of a person's spirit and soul, often also overlap, as both are either contrasted with or given ontological priority over the 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. In English Bibles, "the Spirit" (with a capital "S"), specifically denotes the Holy Spirit.
Spirit is often used metaphysically to refer to the consciousness or personality.
Historically, it was also used to refer to a "subtle" as opposed to "gross" material substance, as in the famous last paragraph of Sir Isaac Newton's Principia Mathematica.

Source: Wikipedia