Life is traditionally defined as things that can move, reproduce, and so
on, but even this simple definition excludes mules, who are sterile.
I define Life as:
1) Anything designed primarily by evolution.
2) Anything sentient.
--
sentience@pobox.com Eliezer S. Yudkowsky
http://tezcat.com/~eliezer/singularity.html
http://tezcat.com/~eliezer/algernon.html
Disclaimer: Unless otherwise specified, I'm not telling you
everything I think I know.