
1) Arcanum 2) Authentication method 3) Confirm in writing 4) Deli menu 5) French word used in English 6) Military terminology 7) Parole 8) Password 9) Positive identification 10) Secret 11) Watchword 12) Word
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https://www.crosswordclues.com/clue/countersign

1) Attest 2) Countersignature 3) Endorse 4) Guarantee 5) Password
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https://www.crosswordclues.com/clue/countersign
[legal] Countersigning means writing a second signature onto a document. For example, a contract or other official document signed by the representative of a company may be countersigned by his supervisor to verify the authority of the representative. Also, a money order or other financial instrument may be signed once upon receipt, then si...
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http://en.wikipedia.org/wiki/Countersign_(legal)
[military] In military terminology, a countersign is a sign, word, or any other signal previously agreed upon and required to be exchanged between a sentry or guard and anybody approaching his or her post. The term usually encompasses both the sign given by the approaching party as well as the sentry`s reply. However, in some armies, the co...
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http://en.wikipedia.org/wiki/Countersign_(military)

• (a.) A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword. • (a.) The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity. • (v. t.) To sign on the opposite side of (an instrument or writing); hence, to sign in addition to the ...
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http://thinkexist.com/dictionary/meaning/countersign/
Coun'ter·sign` adjective 1. The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity.
2. (Mil.) A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword.
Found on
http://www.encyclo.co.uk/webster/C/173
Coun`ter·sign' transitive verb [
imperfect & past participle Countersigned (-s?nd`);
present participle & verbal noun Countersigning .] [
Counter- +
sign : confer F.
contresigner .] To sign on the opposite side of (...
Found on
http://www.encyclo.co.uk/webster/C/173

A countersign is a private signal, word, or phrase given to soldiers on guard, with orders to let no man pass unless he first give that sign; a military watchword or password.
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http://www.probertencyclopaedia.com/browse/FC.HTM

[
v] - add one`s signature to after another`s to attest authenticity
Found on
http://www.webdictionary.co.uk/definition.php?query=countersign
verb add one`s signature to after another`s to attest authenticity; `You must countersign on this line of the contract`
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https://www.encyclo.co.uk/local/20974

a sign used in reply to another sign. · a secret sign that must be given by authorized persons seeking admission through a guarded area. · a signature added to another signature, esp. for authentication.
Found on
https://www.infoplease.com/dictionary/countersign
No exact match found.