I am sorry, but you will never get a final definition of 'spiritual', the whole point of the word and what makes it attractive to people is that it has no real meaning, and can therefore be redefined to mean whatever the speaker/writer wishes. Some on this site have proposed, something like. " Emotional awe at the wonder of nature." As a secular meaning, but you will never stop people using it in a million other ways anyway, even if you do get that, and nothing else, put in all the dictionaries.

Spirituality. It's definition would by it's nature be as slippery as the subjective experiences it attempts to describe or classify.

For myself it generally connotes that someone is about to hold forth on something they know little about and have not done much thought on their own.

OMG, hahaha. Fucking awesome.

But all joking aside, I DGAF about having a common definition for spirituality. I’m still gonna use the term in the way that makes most sense to me. I don’t want to be pigeonholed, ya know?