The quality of being consistent and unchanging; agreement or harmony between parts; also the degree of thickness or density of a substance.
From Latin consistentia (consistere 'to stand together' + -entia noun suffix). The word evolved to mean both logical coherence and physical thickness.
Medieval alchemists used 'consistence' to describe the thickness of their mysterious brews, while philosophers used it for logical coherence—same word for physical and mental harmony!
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