The permanent end of all life functions in an organism or part of an organism.
Source
WordNet Search - 2.1. Death. Cognitive Science Laboratory. Princeton University
http://wordnet.princeton.edu/perl/webwn?s=death
An Alternative Definition
The state of a thermodynamic biosystem in which it cannot get and organize autonomously the energy from the environment.
Source
Nahle M. 2004. Meaning of Death: Biological Death
Biology Cabinet. Available at: http://biocab.org/Biological_Death.html

