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Definition of: countersign
(koun′tər·sīn′, koun′tər·sīn′) v.t.
To sign alongside of or in addition to (the signature of another); authenticate by an additional signature.
—noun (koun′tər·sīn′)
1. A secret word or phrase to be given, as to a sentry; a watchword; password.
2. A counter-signature.
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