A person who sues or petitions together with another person, especially in legal proceedings.
From Latin 'co-' meaning 'together' and 'suitor' from Old French 'suite', meaning 'to follow or pursue'. In legal contexts, it refers to joint plaintiffs in a case.
Medieval legal documents are filled with 'cosuitors'—when multiple people had claims to land or property, they'd sue together, and this word precisely captured that legal relationship in a way that 'joint plaintiff' doesn't quite.
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