Vacuity comes from Latin vacuitās ('emptiness, freedom'), from vacuus ('empty'), from vacāre ('to be empty'). In current use it is a noun meaning "emptiness of mind, content, or space; lack of substance". That sense is explained by the older material without requiring a speculative semantic step: the inherited or borrowed base supplies the field of meaning, while the English formation fixes its modern role. The history is mainly one of transmission into English, with the older form and sense carried through borrowing or adaptation. The historical chain includes Latin vacuitās and Latin vacuus. Related English forms include vacuous, vacuum, vacate, and vacant. For dictionary purposes, the important point is the continuity between the older form, the route into English, and the present lexical sense.