[ noun, verb koun-ter-sahyn; verb also koun-ter-sahyn ]
/ noun, verb ˈkaʊn tərˌsaɪn; verb also ˌkaʊn tərˈsaɪn /
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a sign used in reply to another sign.
Military. a secret sign that must be given by authorized persons seeking admission through a guarded area.
a signature added to another signature, especially for authentication.
verb (used with object)
to sign (a document that has been signed by someone else), especially in confirmation or authentication.
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
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Origin of countersign

1585–95; counter- + sign, modeled on Middle French contresigne, or its source, Old Italian contrasegno
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use countersign in a sentence

British Dictionary definitions for countersign


verb (ˈkaʊntəˌsaɪn, ˌkaʊntəˈsaɪn)
(tr) to sign (a document already signed by another)
noun (ˈkaʊntəˌsaɪn)
Also called: countersignature the signature so written
a secret sign given in response to another sign
mainly military a password
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012