counterstan

v. t. [ imp. & p. p. Countersigned p. pr. & vb. n. Countersigning. ] [ Counter- + sign: cf. F. contresigner. ] 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. [ 1913 Webster ]

a. 1. The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity. [ 1913 Webster ]

2. (Mil.) A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword. [ 1913 Webster ]

a. 1. The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity. [ 1913 Webster ]

2. (Mil.) A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword. [ 1913 Webster ]