turnkey

The keeper of the keys in a prison; a jailer.

Supplied, installed, or purchased in a condition ready for immediate use, occupation, or operation.

Of or relating to something supplied, installed, or purchased in this manner.

The person who has charge of the keys of a prison, for opening and fastening the doors; a prison warden.

An instrument, now almost obsolete, used for extracting teeth.

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

An instrument with a hinged claw, — used for extracting teeth with a twist.

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.

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)

A warder or jailer / gaoler; keeper of the keys in a prison.