Definition of turnkeys:
(adj) :
Ready to use without further assembly or test; supplied in a state that is ready to turn on and operate (typically refers to an assembly that is outsourced for manufacture).
(n) :
A system that is supplied ready to switch on and operate.
(v) :
(transitive) To supply a turnkey product; to supply something fully assembled and ready to use.
(n) :
(archaic) A warder or jailer; a keeper of the keys in a prison.