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Countersign (Noun)

A secret word or phrase known only to a restricted group; "he forgot the password".

Nouns denoting communicative processes and contents.

The general gave the countersign to the sentry, who then allowed him to pass through the gate.
Only those who knew the countersign were allowed to enter the secret meeting.
The password was changed every week, but the countersign remained the same for months.
She forgot the countersign and was denied access to the classified documents.
The countersign was given to only a handful of trusted officers, who were sworn to secrecy.

A second confirming signature endorsing a document already signed.

Nouns denoting communicative processes and contents.

The president's signature on the treaty was valid only after the countersign of the secretary of state.
The contract was not binding until the countersign of the company's CEO was obtained.
The general's aide was authorized to provide the countersign on military orders.
The countersign of the bank manager was required on all large transactions.
The ambassador's signature on the diplomatic letter was followed by the countersign of the foreign minister.