A person who petitions or makes a formal written request jointly with one or more other people.
From 'co-' (together) + 'petitioner' (one who petitions, from Latin 'petitio,' a request). A legal or formal term that emerged in English legal documents.
Copetitioners are important in divorce law and civil court cases—when multiple people file a petition together, it shows collective grievance and is often more persuasive than individual complaints, which is why organizers encourage group action.
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