fluxion

noun

flux·​ion ˈflək-shən 

1

: the action of flowing or changing

also : something subjected to such action

2

: derivative sense 3 compare method of fluxions

fluxional

ˈflək-shnəl 

-shə-nᵊl

adjective

Word History

First Known Use

1599, in the meaning defined at sense 1