turnkey

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The keeper of the keys in a prison; a jailer.
• adjective Supplied, installed, or purchased in a condition ready for immediate use, occupation, or operation.
• adjective Of or relating to something supplied, installed, or purchased in this manner.

from The Century Dictionary.

• noun The person who has charge of the keys of a prison, for opening and fastening the doors; a prison warden.
• noun An instrument, now almost obsolete, used for extracting teeth.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Of or pertaining to a building, complex device, system, or industrial installation which is sold by a contractor only after it is ready for immediate occupation or use; fully functional and ready for use; -- used of complex systems of a type which often require preparation or installation by the user before being capable of functioning as intended.
• noun A person who has charge of the keys of a prison, for opening and fastening the doors; a warder.
• noun (Dentistry) An instrument with a hinged claw, -- used for extracting teeth with a twist.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective 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)
• noun A warder or jailer / gaoler; keeper of the keys in a prison.
• verb to supply a turnkey product; to supply something fully assembled and ready to use

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who guards prisoners