Apedia

 A Countersign Noun Signature Authenticity Signed Sign Verb

Title countersign
Text
Merriam-Webster's Collegiate Dictionary
coun·ter·sign

 \\-ˌsīn\\ noun
 DATE  1591
1. a signature attesting the authenticity of a document already signed by another
2. a sign given in reply to another; specifically : a military secret signal that must be given by one wishing to pass a guard
• countersign transitive verb
• coun·ter·sig·na·ture 
 \\ˌkau̇n-tər-ˈsig-nə-ˌchu̇r, -chər, -ˌtyu̇r, -ˌtu̇r\\ noun
English Etymology
countersign
  1590s (n.), from 
O.Fr
http://O.Fr
. contresigne, from contre- "against" (see contra) + signe "sign" (see sign).
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
countersign
coun·ter·sign 5kauntEsainNAmE -tErs- / verb[VN]
   (technical 术语) to sign a document that has already been signed by another person, especially in order to show that it is valid
   连署,副署,会签(文件)
Merriam-Webster's Collegiate Thesaurus-11th Edition
v. Function: noun 

Synonyms: 
PASSWORD
 1, watchword, word
Webster's Third New International Dictionary, Unabridged
coun·ter·sign
I. \ˈ ̷ ̷ ̷ ̷+ˌ-\ noun
Etymology: counter- + sign (n.); translation of French contresigne
1. 
 a. : a special mark for identifying or authenticating : 
countermark
 b. : the signature of a secretary or other person to attest authenticity of a piece of writing already signed by another
2. : a sign used in reply to another; specifically : a military secret signal (as a word or phrase) that must be given by anyone wishing to pass
II. \| ̷ ̷ ̷ ̷+|\ transitive verb
Etymology: counter- + sign (v.); translation of French contresigner
1. : to add one's signature to (a document) after another's to attest authenticity
2. : 
confirm
corroborate
sanction

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