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countersign

coun·ter·sign

countersign

 
pronunciation:
kaUn tr saIn
parts of speech:
noun, transitive verb
part of speech: noun
definition 1: a password or secret signal used to identify an ally.
definition 2: a word, phrase, or signal given as a response to that of another.
definition 3: a second or additional signature, esp. one made to confirm the authenticity of the first.
 
part of speech: transitive verb
inflections: countersigned, countersigning, countersigns
definition: to add an additional signature to in order to attest to authenticity or to guarantee the conditions of (a contract).
My mother countersigned my mortgage.
derivation: countersignature (n.)