Definition of countersign verb from the Oxford Advanced Learner's Dictionary

 

countersign

 verb
verb
BrE BrE//ˈkaʊntəsaɪn//
 
; NAmE NAmE//ˈkaʊntərsaɪn//
 
Verb Forms present simple I / you / we / they countersign
BrE BrE//ˈkaʊntəsaɪn//
 
; NAmE NAmE//ˈkaʊntərsaɪn//
 
he / she / it countersigns
BrE BrE//ˈkaʊntəsaɪnz//
 
; NAmE NAmE//ˈkaʊntərsaɪnz//
 
past simple countersigned
BrE BrE//ˈkaʊntəsaɪnd//
 
; NAmE NAmE//ˈkaʊntərsaɪnd//
 
past participle countersigned
BrE BrE//ˈkaʊntəsaɪnd//
 
; NAmE NAmE//ˈkaʊntərsaɪnd//
 
-ing form countersigning
BrE BrE//ˈkaʊntəsaɪnɪŋ//
 
; NAmE NAmE//ˈkaʊntərsaɪnɪŋ//
 
Legal documents
 
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countersign something (specialist) to sign a document that has already been signed by another person, especially in order to show that it is valid All orders must be countersigned by one of the directors. See related entries: Legal documents Word Origin late 16th cent. (as a noun): from French contresigner (verb), contresigne (noun), from Italian contrassegno, based on Latin signum ‘sign’.
See the Oxford Advanced American Dictionary entry: countersign