How about for a starter, "the state or fact of being real." Literally. Or philosophically speaking, "that which exists without ideas concerning it" or simply, "that which is real."
It's an idea .. a word .. a symbol representing an idea .. how many ideas are there .. does the definition of reality mean more to the child under a bomb for 25 continuous years as those in I raq or for the presidents daughter or Dicks for that matter or for the girl who was raped by a soldier, a father a mother or friend ..