The quality or state of being immortal or deathless; exemption from death or the pursuit of eternal life.
From Greek 'athanasia' combining 'a-' (without) and 'thanatos' (death). The term describes freedom from death, a concept central to both Greek philosophy and Christian theology.
Every religion and philosophy has grappled with athanasia—from Greek philosophers to Christian theology to modern transhumanism—the dream of escaping death is basically universal to human culture.
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