Vinculum comes from Latin 'vinculum' ('a bond, fetter, tie'), from 'vincire' ('to bind, fetter'). The mathematical sense of an overbar grouping terms is a modern technical extension. In current use it is a noun meaning "a bond or tie; a bar drawn over grouped mathematical terms". 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 vinculum and Latin vincire. Related English forms include vinculate. The semantic development is therefore important as well as the form: the word moves from the older concrete, technical, or literal setting into the present figurative or specialized sense.