technically in my opinion life is the concept that any sentient being gives it. In reality it cannot be trully described even by one type of language, be it mathmatical, biological, physical, or other but by the individual based on its own experances your cat or dog has a different take on life than you do just like one person to the next a gang member might think life is short and meanigless as a buddist thinks every life means everthing and you have more than one to attend to this is a little off topic but goes with gist of the argument as a whole