For me, my sense of “spirituality” is an amorphic sense of connectedness to the world around me. My analytical mind is most comfortable assuming that this sense involves the exchange of subatomic particles amongst all matter.
I also think that the concept of being “spiritual” is wholely unique to each individual “live” being, and that no being experiences it the same way as another.
The concept of a spirit really has nothing to do with it, but when pressed to try and explain my concept of a “spirit”, I consider the physical form as a constantly changing vessel for a constantly changing awareness.
While “alive”, a body feeds, expells waste, grows, ages, perhaps mates, perhaps reproduces, and is in a constant state of simultaneous physical decay and renewal, releasing parts of itself into the environment, while taking things into itself from the environment. This all happens until the moment when it ceases to be alive and all physical matter decays and is completely released into the environment, where it is taken into many other physical forms.
The same things happens to the “spirit”. It is constantly changing, decaying, renewing. Releasing parts of itself into the environment, while taking things into itself from the environment. This all happens until the moment of death, when this “spirit” and the physical form have are no longer in sync, and it is completely released into the environment and taken into many other physical forms.
But again, this is my attempt to put words to my own unique perspective, and (I believe) not something that is shared by anyone else.