Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To sign (a previously signed document) to vouch for the authenticity of the document.
  • noun A second or confirming signature on a previously signed document.
  • noun A sign or signal to be given to a sentry in order to obtain passage; a password.
  • noun A secret sign or signal given in answer to another.

from The Century Dictionary.

  • To sign opposite to another signature; sign additionally; superadd one's signature to by way of authentication, attestation, or confirmation: as, charters signed by a king are countersigned by a secretary.
  • Figuratively, to attest in any way; confirm; corroborate.
  • noun A private signal, in the form of a word, phrase, or number, given to soldiers on guard, with orders to let no one pass unless he first gives that sign; a military watchword.
  • noun The signature of a secretary or other subordinate officer to a writing signed by the principal or superior, to attest its authenticity; a counter-signature.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity.
  • adjective (Mil.) A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword.
  • transitive verb 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a second signature added to a document to affirm the validity of the signature of the first person
  • verb transitive to add a second signature to a document, affirming the validity of the signature of another person

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb add one's signature to after another's to attest authenticity
  • noun a secret word or phrase known only to a restricted group
  • noun a second confirming signature endorsing a document already signed

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

counter- +‎ sign

Examples

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