The quality or state of being unchanging, permanent, or eternal; the absence of change.
From 'changeless' (from 'change' + the suffix '-less' meaning without) + the suffix '-ness' (forming abstract nouns). Both suffixes are among English's most productive, allowing endless combinations.
Philosophers and physicists have long been obsessed with changelessness—from Plato's eternal forms to Einstein's spacetime—yet one of the deepest discoveries of modern science is that absolutely nothing truly exhibits changelessness, even atoms and stars transform.
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