density

The word "density" has its origins in the Latin word "densitas," which is derived from "densus," meaning "thick" or "crowded." The suffix "-ity" is used in English to form nouns that denote a quality or state. The term "density" was adopted into English in the late Middle Ages, likely through Old French, as many Latin words entered English by this route. In scientific contexts, "density" refers to the degree of compactness of a substance and has been used in this specific sense since the early 17th century.