Pronunciation: (hook'up"),[key] —n. 1. an act or instance of hooking up.
2. an assembly and connection of parts, components, or apparatus into a circuit, network, machine, or system.
3. the circuit, network, machine, or system so formed.
4. a device or connection, as a plug, hose, or pipe, for conveying electricity, a water supply, etc., from a source to a user: Some campsites have electrical hookups for trailers. 5. Informal.an association, alliance, or cooperative effort: A closer hookup of Caribbean nations would be good for international trade.