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Meaning of countersign

coun•ter•sign

Pronunciation: (n., v.koun'tur-sīn"v.also koun"tur-sīn'), [key]
— n.
  1. a sign used in reply to another sign.
  2. a secret sign that must be given by authorized persons seeking admission through a guarded area.
  3. a signature added to another signature, esp. for authentication.
—v.t.
  1. to sign (a document that has been signed by someone else), esp. in confirmation or authentication.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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