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Collins Dictionary of Biology (3rd Edition) defines 'death' as: The end of the state which enables living matter to acquire energy from the environment; the termination of the collective activities of an organism.
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Saunders Comprehensive Veterinary Dictionary (3rd Edition, 2007) defines 'death' as: The cessation of all physical and chemical processes that invariably occurs in all living organisms. Even in humans there is at present no standardized diagnosis of clinical death. The existing procedure, and the one recommended for use in animals, is to declare the animal dead when brain death has occurred. Brain death has occurred when the animal is in a deep irreversible coma.
The Merriam-Webster Dictionary defines 'death' as: A permanent cessation of all vital functions: the end of life. The irreversible cessation of all vital functions especially as indicated by permanent stoppage of the heart, respiration, and brain activity: the end of life.
Oxford Learners' Dictionary defines 'death' as: 1. the fact of someone dying or being killed. 2. the end of life; the state of being dead. 3. death of something the permanent end or destruction of something. 4. the power that destroys life, imagined as human in form.
Encyclopedia Britannica defines 'death' as: Death, the total cessation of life processes that eventually occurs in all living organisms. The state of human death has always been obscured by mystery and superstition, and its precise definition remains controversial, differing according to culture and legal systems.
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