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countersign

[n., v. koun-ter-sahyn; v. also koun-ter-sahyn] /n., v. ˈkaʊn tərˌsaɪn; v. also ˌkaʊn tərˈsaɪn/
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
1585-1595
1585-95; counter- + sign, modeled on Middle French contresigne, or its source, Old Italian contrasegno
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for counter-signed

countersign

verb (ˈkaʊntəˌsaɪn; ˌkaʊntəˈsaɪn)
1.
(transitive) to sign (a document already signed by another)
noun (ˈkaʊntəˌsaɪn)
2.
Also called countersignature. the signature so written
3.
a secret sign given in response to another sign
4.
(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
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Word Origin and History for counter-signed

countersign

n.

1590s, from Middle French contresigne, from contre- "against" (see contra-) + signe "sign" (see sign (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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Difficulty index for countersign

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Word Value for counter

9
12
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