I find autopoiesis ("self-constructing, self-maintaining, energy-transducing autocatalytic entities") to be the most satisfying definition of Life. But I find it weird that they would throw that term out there without citing Humberto Maturana or Francisco Varela, who came up with the concept.

They wrote mostly long essays in obscure philosopher's jargon, but one day decided to go ahead and explain everything very simply; they wrote The Tree of Knowledge, which summarizes their philosophy in the style of a children's book. Very worth reading if you're into these kinds of questions. I found a PDF here:

https://www.cybertech.swiss/research/references/Maturana1988...