Coun′ter‐sign″ (–s?n′; 277), v. t. [imp. & p. p.Countersigned (–s?nd′); 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.