Bible Encyclopedias
Countersign
1911 Encyclopedia Britannica
a military term for a sign, word or signal previously arranged and required to be given by persons approaching a sentry, guard or other post. In some armies the "countersign" is strictly the reply of the sentry to the pass-word given by the person approaching.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Countersign'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/c/countersign.html. 1910.