Turn"key` (?), n.; pl. Turnkeys (&?;).

1. A person who has charge of the keys of a prison, for opening and fastening the doors; a warder.

2. (Dentistry) An instrument with a hinged claw, -- used for extracting teeth with a twist.

Turn"key` (?), n.; pl. Turnkeys (&?;).

1. A person who has charge of the keys of a prison, for opening and fastening the doors; a warder.

2. (Dentistry) An instrument with a hinged claw, -- used for extracting teeth with a twist.

• A warder or jailer / goaler; keeper of the keys in a prison
  
• 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)
       They wanted a turnkey solution for the entire system, but we could only provide the enclosure.
  
• to supply a turnkey product; to supply something fully assembled and ready to use
       We can sell you all the parts, or we can turnkey the entire unit.