This is the 5111th most frequent Spanish word.
fluido
"Fluido" in Spanish means "fluid" in English, referring to a substance that flows, such as a liquid or gas, or something smooth and continuous.
In this context, 'fluido' describes the physical property of the liquid, emphasizing its viscosity or ease of flowing.
El líquido en el vaso es muy fluido.
The liquid in the glass is very fluid.
Here, 'fluido' refers to proficiency, meaning he can speak and use English with ease and without hesitation.
Él tiene un dominio fluido del inglés.
He has a fluent command of English.
In this usage, 'fluida' points to the smooth and uninterrupted nature of the discussion.