turnkey

adj

1. 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).

   “They wanted a turnkey solution for the entire system, but we could only provide the enclosure.”

   “Third World countries no longer want to purchase nuclear projects on a turn-key basis; they want to receive advanced technical training as well.”

   “He cautioned that the house “is not turnkey,” and that because it is “so unusual,” it may take a while to sell. But, he added, “It’s a joy to be selling a property with its history.””

noun

1. A system that is supplied ready to switch on and operate.

   “The hardware-software costs are packaged together. Turnkeys are either special purpose (e.g., only for one function such as libraries) or general purpose […]”

2. (dated)A warder or jailer; a keeper of the keys in a prison.

   “He saw the same Turnkey unfetter a man / With but little expedition, / Which put him in mind of the long debate / On the Slave-trade abolition.”

   “[…]they passed through an open door into a lobby, from which a heavy gate, opposite to that by which they had entered, and which was guarded by a stout turnkey with the key in his hand, led at once into the interior of the prison.”

   “'Certainly not,' said the turnkey; and the first corroborated his statement.”

verb

1. (transitive)To supply a turnkey product; to supply something fully assembled and ready to use.

   “We can sell you all the parts, or we can turnkey the entire unit.”