hookup

1. A system or network of electrical circuits or equipment designed to operate together.
2. 1. A configuration of mechanical parts or devices providing a link between a supply source and a user: a gas hookup for a mobile home.
   2. A plan or schematic drawing of such a system or such a configuration.
3. Informal. A linkage or connection, often between unlikely associates or factors.

noun

A logical or natural association between two or more things: connection, correlation, interconnection, interdependence, interrelationship, link, linkage, relation, relationship, tie-in. See connect.

The noun has 2 meanings:

Meaning #1: a device providing a connection between a power source and a user

Meaning #2: a system of components assembled together for a particular purpose
  Synonym: assemblage