The keeper of the keys in a prison; a jailer.
1. Supplied, installed, or purchased in a condition ready for immediate use, occupation, or operation: a turnkey computer system; a turnkey housing project.
2. Of or relating to something supplied, installed, or purchased in this manner: a turnkey agreement.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
archaic a keeper of the keys, esp in a prison; warder or jailer
(Civil Engineering) denoting a project, as in civil engineering, in which a single contractor has responsibility for the complete job from the start to the time of installation or occupancy
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., pl. -keys,
1. a person who has charge of the keys of a prison; jailer.
2. ready for occupancy when turned over to the owner: turnkey housing.
3. fully equipped; ready to go into operation: a turnkey power plant.
Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.