n. pl. turn·keys
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.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.