G. Mark’s Answer
Life is experience. Consider. There have been experiments that prove that our entire being is involved in making decisions, and that what we perceive as our "mind" or "self" is actually a sort of illusion. I take that as meaning that everything in our body is doing stuff to keep us alive and to make us feel certain ways and our brains are running hundreds of little processes simultaneously that keep our hearts beating and our memories of eating that piece of pizza intact and giving us a pang of anxiety that tells us there's something we forgot to buy at the store.
Another aspect of life is that the world around us is far, far different from what we perceive. Not only is there a lot going on that we just can't and don't notice, but a lot of what we notice just ain't so. We have an "image" of what happened, and experiments have often proved that reality is only approximated in our minds and memories. So most of us agree that "perception" is not the same as "reality". So "life" is what we experience. Nothing less and nothing more. And that is kind of cool.