The act or process of making something eternal or preserving it permanently (American spelling of eternisation).
From eternize (American spelling of eternise) plus -ation suffix. This is the American English variant of the British eternisation, following different spelling conventions for -ize versus -ise.
The Rosetta Stone achieved eternization through its dual-language inscription—by encoding meaning in permanent stone and multiple languages, ancient Egyptians ensured their knowledge would survive any single culture's collapse.
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