A condition that must exist or be established before something can occur or be considered; a prerequisite: a precondition for peace.
tr.v. pre·con·di·tioned, pre·con·di·tion·ing, pre·con·di·tions
To condition, train, or accustom in advance: “His ideas … preconditioned him to expect defeat” (Lawrence G. Smith).
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.