Too great, vast, or complex to be counted, measured, or estimated; beyond calculation.
From Latin prefix 'in-' (not) plus 'calculable' (able to be calculated), from 'calculare' (to count). The root goes back to 'calculus,' a stone used for counting.
The Romans literally used pebbles or stones to count, calling them 'calculi'—that's where we get the math term 'calculus' and the word 'calculate'! Something incalculable is so huge even those ancient stone-counting methods would fail.
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