flux 
/ˈflʌks/ noun
/ˈflʌks/ noun [noncount] 1 : a series of changes : continuous change
▪ Language is in a state of constant flux. = Language is constantly in a state of flux. [=language is changing constantly] 2 technical : a substance used for helping to melt or join metals
▪ Language is in a state of constant flux. = Language is constantly in a state of flux. [=language is changing constantly]
