What is the meaning of Nexus?

A form or state of connection.

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.

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).

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.

bound, tied, fastened, connected, interwoven, having been bound.

bound by obligation, obliged, made liable, pledged, having been obliged.

debtors who, having failed to cover the security they owed to their creditor, were enslaved to them as bondsmen (the practice was abolished in 326 BC, see quote)

the act of binding, tying or fastening together

something which binds; bond, joint, binding, fastening; connection; nexus

a personal obligation of a debtor

a legal obligation

Source: wiktionary.org