Actually thank you’s probably belong in a different category. This is General Questions. Sorry about that.
To show the range of the debate - some folks consider even inanimate object to posess spirit.
I’m glad you mentioned that. I’m one of those who think all things are alive to a certain extent. Even a rock has a low level of mind. Matter has an innate tendency to form ever more complex associations, and consciousness is the result of complex organization.
“Got a factual question for the Teeming Millions (and possibly Cecil) to consider? Post it here.”
In case you missed it, that’s the tagline for this board… 
Yes, Great Debates is more appropriate for discussion of spiritual issues.
Moving from GQ.
Colibri
General Questions Moderator
You’re not going to find a single definition that covers all these uses, since there are at least two totally separate usages of the word you’re referring to here. The closest you’re going to get is that all these uses have developed from a shared root concept of ‘life’.
“my horse has lots of spirit” - here ‘spirit’ means something aking to ‘enthusiasm, energy, and/or liveliness’. A disspirited horse (or person) is lethargic and unmotivated.
“the old school spirit” - Same sort of spirit as above; this refers to enthusiasm, energy, and/or liveliness felt for or demonstrated on behalf of the school.
“will my spirit go to heaven?” - this is an entirely distinct usage of the word from the above two uses - in this, the word ‘spirit’ means something akin to the word ‘ghost’. As for whether the spirit includes the mind, there is little or no general concensus about that. Some think that each person has a distinct spirit of their own that shares their mind and personality; some believe that each person’s spirit is a mass of malleable energy that will join up with and/or be assimilated into groups of other spirit and/or God after death. Some believe in a combination of the two options, and some believe something entirely different. About the only general concensuses about spirit is that it describes some part of a person that lingers on past the person’s mortal death in a non-physical form. (Also note that there isn’t complete consensus that such a thing even exists.)
“The Holy Spirit” - There is little or no general concensus as to what this means. Some groups consider this to be a specific entity, with the word meaning something akin to the word “ghost” like in the above definition, except this is a specific, high-ranked non-physical individual. Some consider this to be a non-individualized manifestation of God’s or Jesus’s power. And, of course, some people consider this to be bad fiction. 
It’s the class designation of the B-2 Bomber, of course.
Wang Chi: My mind and my spirit are as one.
Jack Burton: As two! I’m coming with you.
How about that ol’ Janx Spirit?
Ya beat me to it, doggonit!
viccums, you might find Gilbert Ryle’s The Concept of Mind worth a read. It’s addresses, among other things, the soul v. mind problem. His thesis, to simplify, is that the latter does not imply the former. Cliff Notes version at Wikipedia.
No. For one thing, your mind is something you can be sure actually exists.
You might want to start, viccums, by reading the Wikipedia articles on spirit and soul. Not definitive, but definitely comprehensive. And it will become immediately apparent that any all-comprehensive definition of either is impossible, or else so vague as to obscure very essential differences in usage. It’s almost like asking for a single-sentence definition of “orange” that unambiguously covers the color, the fruit, and the Dutch royal family.