pneuma

n. vital spirit; soul; holy spirit (Christianity)

Pneumatology is the study of spiritual beings and phenomena, especially the interactions between humans and God. Pneuma (πνευμα) is Greek for "breath", which metaphorically describes a non-material being or influence. World Book Dictionary defines pneumatology as "1. Theology the doctrine of the Holy Spirit. 2. The doctrine of spirits or spiritual beings, in the 1600s considered a branch of metaphysics. 3. pneumatics. 4. Obsolete word for psychology."
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n. pneuma, vital spirit; soul; holy spirit (Christianity)

Pneuma (Greek) [from pneo to breathe] Wind, air, breath, vitality, spirit, an animated being, also a spiritual being; in the New Testament (John 3:8) "The wind bloweth where it listeth . . . so is every one who comes into being (or becomes) out of the Spirit" -- the word for both wind and spirit is the single word pneuma. It is also translated in the New Testament as "ghost," as in Holy Ghost and yielded up the ghost, and as "spirit" in various senses. The same connection between air and spirit is seen in the Latin anima (life) and animus (mind), which derive from the same root as the Greek anemos (wind); also in spiritus [from spiro to blow, breathe], and the same holds good in other languages, illustrating the correlation of air or wind with vitality: jiva, prana, mind, manas, etc. The triad of sun or fire, moon or water, and pneuma, spirit, or wind, corresponds with Father-Mother-Son and with atma-buddhi-manas. The word is equivalent to breath so often used in The Secret Doctrine, in a comprehensive sense.

Holy Spitit/Ghost]