from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To sign (a previously signed document), as for authentication.
- n. A second or confirming signature, as on a previously signed document. Also called countersignature.
- n. A sign or signal to be given to a sentry in order to obtain passage; a password.
- n. A secret sign or signal given in answer to another.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a second signature added to a document to affirm the validity of the signature of the first person
- v. to add a second signature to a document, affirming the validity of the signature of another person
from the GNU version of the Collaborative International Dictionary of English
- transitive v. 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.
- adj. The signature of a secretary or other officer to a writing signed by a principal or superior, to attest its authenticity.
- adj. A private signal, word, or phrase, which must be given in order to pass a sentry; a watchword.
from The Century Dictionary and Cyclopedia
- 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.
- n. 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.
- n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. add one's signature to after another's to attest authenticity
- n. a secret word or phrase known only to a restricted group
- n. a second confirming signature endorsing a document already signed
counter- + sign (Wiktionary)