COUNTERSIGNED

Verb

countersigned

simple past tense and past participle of countersign

Source: Wiktionary

COUNTERSIGN

Coun`ter*sign" (-sn`; 277), v. t. [imp. & p. p. Countersigned (- snd`); p. pr. & vb. n. Countersigning.] Etym: [Counter- + sign: cf. F. contresigner.]

Definition: 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`, a.

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

2. (Mil.)

Definition: A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword.

Source: Webster’s Unabridged Dictionary 1913 Edition