attractivity comes from attractive + -ity, from Latin attractus, past participle of attrahere ('to draw toward'), from ad- ('to') + trahere ('to draw, drag'). Morphologically, the word is transparent: -ity is attached to the older base named in the history, so the modern form packages an inherited or borrowed stem inside a later English derivative. In modern use, the noun sense is "the quality or power of attracting; attractiveness", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as attractive, attract, attraction, attractively, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Latin attrahere, Latin trahere, which anchor the explanation in named linguistic material.