2 entries under this word

Countersign

Coun'ter-sign, v. t.

verbtransitive

(-sīn), v. t. [imp. & p. p. COUNTER-SIGNED; p. pr. & vb. n. COUNTERSIGNING.] 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.

Coun'ter-sign, n.

noun

n. 1. The signature of a secretary or other subordinate officer to a writing signed by the principal or superior, to attest its authenticity. 2. (Mil.) A private signal, word, or phrase, which must be given in order to pass a sentry; a military watchword.