> density functional theory The origin of all three words is Latin: density from densitas, functional from functiō, theory from theōria. Both Romanian and Fre

> density functional theory The origin of all three words is Latin: density from densitas, functional from functiō, theory from theōria. Both Romanian and French are Romance languages, i.e. their origin is Latin, and English (a Germanic language) also has strong Latin and French influences, mostly borrowed words like these.