1. Science does not seek to name qualities but to
find how their processes work. Definitions are like the definitions in an algebra problem. You can define X as equal to anything for the sake of a problem where you are solving for Y etc.
2. Are we truly allowed to self-define? If so, I choose a variable definition.
a) Where my attention is focused, there am I
and so am defined AT THAT TIME by my attention.
b) Where my physical body is located, there you will find a version of me.
c) My natural history, including the threads of DNA leading to and beyond me, and the ecologies which shaped that thread -- these imply I am
a part of a quasi-hologram, the study of which can yield understanding of other parts of universe. And my chemistry, of course, would yield almost all the elements for study by a newcomer to universe if I were found in deep space on the edge of all the galaxies.
d) "I am everyone I have ever loved," as the song goes...or the joke? This may include all my dreams and yearnings and beliefs too.

What am I not?
I am not the delusions others have about me.
Thanks, Phillip. Can you venture more?