* Fluidity: This is the most common and general translation, referring to the quality of flowing smoothly.
* Smoothness: This emphasizes the lack of friction or resistance in the flow.
* Ease: This highlights the effortless quality of the flow.
* Flow: This can be used as a noun or verb, depending on the context.
To give you the most accurate English translation, please provide the context of the word "fluidez" in your Spanish sentence.