A philosophical doctrine or belief that something is eternal, timeless, or exists outside of time; a viewpoint emphasizing permanent or unchanging truths.
From 'eternal' plus the philosophical suffix '-ism' (indicating a school of thought or belief system). Emerged in philosophical discourse to describe metaphysical positions about timelessness.
Einstein's theory of relativity actually challenged eternalism—he showed time isn't absolute and unchanging, which blew up the old philosophical idea that some things exist outside time!
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