nexus

A means of connection; a link or tie.

A connected series or group.

The core or center.

Tie; connection; interdependence existing between the several members or individuals of a series or group.

In medieval music, melodic motion by skips.

In Roman law:

A free-born person who had contracted the obligation called nexum, and thus became liable to be seized by his creditor if he failed to pay, and to be compelled to serve him until the debt was discharged.

The bond or obligation by which such a person was held.

Connection; tie.

a form of connection