Definitions of countersign
v. t. - To sign on the opposite side of (an instrument or writing); hence, to sign in addition to the signature of a principal or superior, in order to attest the authenticity of a writing. 2
a. - The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity. 2
a. - A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword. 2
The word "countersign" uses 11 letters: C E G I N N O R S T U.
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