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-Removed-Actually, I think there is a definite overlap with philosophy [please note the success of posters such as bbarr or LemonJello in the past]. Specifically: it deals with the part of humans that seeks transcendence - of/above/over the simple, mundane considerations of physical existence.
Edit: and are not theistic writings, such as the book of Proverbs, chock full of life philosophy?
-Removed-I think a more practical and revealing application of the word "spirituality" is that it is the aspect of the human consciousness - and religious/philosophical activity attendant thereto - that perceives the existence or non-existence of "the ghost" [and what you refer to when you say "the spirit"] and/or the side of we humans - our human nature - that is curious and speculative about notions of "the ghost" and other conjecture about the role of the supernatural within reality. I realize the dictionary backs you and not me on this. But I am just trying to get at what is really going on when people talk about "spirituality" as being some sort of realm.