1. a person who makes a formal written request, especially to a court or government authority
Usage: legal
2. a person who organizes or signs a petition for a cause or change

Examples

• The petitioner filed for divorce in family court.
• As the petitioner in the case, she had to present her evidence first.
• The court ruled in favor of the petitioner’s request for custody.
• Hundreds of petitioners gathered signatures to save the local park.
• The petitioner argued that the new law violated constitutional rights.
• Each petitioner must provide valid identification when submitting their request.
• The environmental group’s petitioner spoke passionately about climate change.