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“countersign” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

countersign
*una subscribere, subnotare or subsignare.
countersign s.
Private signal given to soldiers on guard, and to those whom they are to admit; tessera (if a ticket): signum (general term). To give the countersign, tesseram or signum dare: to anybody, alicui.

Quick answer

What is the Latin word for countersign?
The usual Latin words for “countersign” are subsignō, tessera, signum. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.