Remaining unchanged or constant regardless of conditions or transformations applied. In mathematics and science, describes properties that stay the same even when other aspects change.
From Latin 'invarians,' combining 'in-' (not) with 'variare' (to change, vary). The word emphasizes the absence of variation, highlighting stability and constancy across different conditions or transformations.
In Einstein's relativity, the speed of light is invariant - it's the same for all observers regardless of their motion. This captures the profound idea that some things remain absolutely constant even when everything else changes!
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