—v.tr.
1 add a signature to (a document already signed by another).
2 ratify.
—n.
1 a watchword or password spoken to a person on guard (cf. PAROLE).
2 a mark used for identification etc.
Derivatives:
counter-signature n.
Etymology: F contresigner (v.), contresigne (n.) f. It. contrasegno (as COUNTER-, SIGN)
Useful english dictionary. 2012.