1.nounA warder or jailer/gaoler; keeper of the keys in a prison.
2.verbTo 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."
3.adjectiveReady 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."