Cessation of life.
A permanent cessation of all vital functions; the end of life (often called mortality). A simple concept whose actual occurrence medicine has made very difficult to define and measure. A con-census appears to be forming that death occurs when all measurable or identifiable brain functioning (electrical or any other kind) is absent for over 24 hours.
The permanent end of all natural functions.
The cessation of life, traditionally indicated by lack of heartbeat and breathing, what some medical professionals now call apparent death. In recent decades, with the develop of ventilators and other technology to assist in maintaining heart and lung functions, a new definition of death has emerged: brain death, which focuses on the lack of activity in the brain. Definitions vary from state to state, however, and the specific definition controlling in a particular area is sometimes called legal death.
State of the body in which brain function ceases and heart function can be maintained only artificially; the state at which loss of brain and heart function is not reversible. In brain death, which has recently become of legal importance, normal reflexes (e.g., respiration) are absent and consciousness cannot be recovered; organs may then be removed for transplantation before the heartbeat has stopped.