And of course that's in direct contrast with the treatment by this DO where he threw out various definitions of spirituality, as if that means he knows any of them or making a distinction "on paper" proves anything. Why even have another word called "spirit" when you treat the subject as a mental issue?
For meditation practitioners it is also not just a matter of feeling good, although that is a popular trend. There are people with backgrounds of abuse there as well as you might imagine, but depending on how strongly the bad feelings are they are either instructed to sit with and observe it, or in the case of a retreat where a lot of stuff might be coming to the surface the instructors may even ask them to discontinue and go home if it's too overwhelming.
And unlike the JWs, they are also familiar with the psychological territory. Some of the instructors may even be practicing therapists, and have integrated the knowledge with their practice.
But as far as your original question, since meaning has to do with something mental the question ultimately does not make sense if spirituality is something subtler than a way of thinking. The teachings would not be something you adopt as beliefs, but simply as something to consider as you do your own work of self exploration. This also literally means that nobody can tell you what it is, you are to "find out" for yourself through experience, rather than any ideas about it.