Where does “fluidity” come from?

Fluidity comes from French fluidité, meaning the quality of flowing or being fluid.

fluidity (English): The state of being fluid rather than viscous; A...

Definitions

Step	Language	Word	Meaning
1	French	fluidité	fluidity
2	Latin	fluiditās	—
3	Latin	fluidus	liquid, fluid, flowing; soft, feeble, moist
4	Latin	fluō	—
5	Proto-Indo-European	bʰléh₁-	—
6	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
7	Proto-Indo-European	bʰōl-	—

fluidity — Etymology, Origin & Word History | Etymology Explorer