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Noun: countersign  'kawn-tu(r),sIn
  1. A secret word or phrase known only to a restricted group
    "he forgot the countersign";
    - password, watchword, word, parole
     
  2. A second confirming signature endorsing a document already signed
    - countersignature
Verb: countersign  'kawn-tu(r),sIn
  1. Add one's signature to after another's to attest authenticity
    "You must countersign on this line of the contract"

Derived forms: countersigns, countersigning, countersigned

Type of: arcanum, positive identification, secret, sign, signature

Encyclopedia: Countersign