tr.v. coun·ter·signed, coun·ter·sign·ing, coun·ter·signs
To sign (a previously signed document) to vouch for the authenticity of the document.
1. A second or confirming signature on a previously signed document. Also called countersignature.
a. A sign or signal to be given to a sentry in order to obtain passage; a password.
b. A secret sign or signal given in answer to another.
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.