a person who has charge of the keys of a prison; jailer.
adjective
2.
Also, turn-key. of, relating to, or resulting from an arrangement under which a private contractor designs and constructs a project, building, etc., for sale when completely ready for occupancy or operation:
Masterfully built with exceptional attention to detail throughout, this beautiful estate is turnkey and ready for the next owners.
Beach properties vary from turnkey condos to duplexes to stand alone single-family homes.
The turnkey project provided single source responsibility and risk management while ensuring project completion.
British Dictionary definitions for turnkey
turnkey
/ˈtɜːnˌkiː/
noun
1.
(archaic) a keeper of the keys, esp in a prison; warder or jailer
adjective
2.
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
Word Origin and History for turnkey
adj.
1650s, "jailer," from turn (v.) + key (n.). In reference to a job that only has to be done once, it is recorded from 1934. The notion is of locking up afterward.