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The Collaborative International Dictionary of English v.0.48 (gcide)

Turnkey \Turn"key`\ (t[^u]rn"k[=e]`), n.; pl. {Turnkeys}
(t[^u]r"k[=e]z`).
1. A person who has charge of the keys of a prison, for
opening and fastening the doors; a warder.
[1913 Webster]

2. (Dentistry) An instrument with a hinged claw, -- used for
extracting teeth with a twist.
[1913 Webster]


turnkey \turn"key`\ (t[^u]rn"k[=e]`), a.
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; as, a
turnkey ethylene production plant; a turnkey apartment
building.
[PJC]