flux

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flux copious flowing of blood, etc. XIV; (gen.) flowing; continuous succession XVI; incoming tide, opp. of reflux XVII; substance facilitating fusion (earlier †fluss — G.) XVIII. In early use (XIV–XVII) also †flix — (O)F. flux or L. fluxus, f. fluere flow.
So fluxion †flow, flowing XVI; (math.) rate of change of a continuously varying quantity XVIII.

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