countersign

[n., v. koun-ter-sahyn; v. also koun-ter-sahyn]
noun
1.
a sign used in reply to another sign.
2.
Military. a secret sign that must be given by authorized persons seeking admission through a guarded area.
3.
a signature added to another signature, especially for authentication.
verb (used with object)
4.
to sign (a document that has been signed by someone else), especially in confirmation or authentication.

Origin:
1585–95; counter- + sign, modeled on Middle French contresigne, or its source, Old Italian contrasegno

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World English Dictionary
countersign
 
vb
1.  (tr) to sign (a document already signed by another)
 
n
2.  Also called: countersignature the signature so written
3.  a secret sign given in response to another sign
4.  chiefly military a password

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

countersign
1590s (n.), from O.Fr. contresigne, from contre- "against" (see contra) + signe "sign" (see sign).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
All persons or objects that answer to the same countersign or that bear the same imprint are thereby stamped as somehow related.
Also, the town board may authorize the comptroller to countersign all checks signed by the supervisor.
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