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English definition of “flux”

flux

noun [U] uk   /flʌks/ us  

flux noun [U] (CHANGE)

continuous change: Our plans are in a state of flux at the moment.Change and changes

flux noun [U] (SUBSTANCE)

specialized engineering a substance added to a metal to make it easier to solder (= join by melting) to another metalTypes of chemicalSpecific chemicals, chemical compounds and gasesSubstances and structures in the body
(Definition of flux from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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