nexus

A form or state of connection.

(Canada, US, finance, law) The relationship between a vendor and a jurisdiction for the purpose of taxation, established for example by the vendor operating a physical store in that jurisdiction.

A connected group; a network, a web.

A centre or focus of something.

(grammar) In the work of the Danish linguist Otto Jespersen (1860–1943): a group of words expressing two concepts in one unit (such as a clause or sentence).

(Ancient Rome, law, historical) A person who had contracted a nexum or obligation of such a kind that, if they failed to pay, their creditor could compel them to work as a servant until the debt was paid; an indentured servant.