Longman Dictionary of Contemporary English homepage

cosignatory

 noun
     
Related topics: Law
co‧sig‧na‧to‧ry plural cosignatories [countable]
SCL one of a group of people who sign a legal document for their department, organization, country etc:
Both cosignatories must sign the cheque.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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