plaintiff
n. countable C1 Advanced US //ˈpɫeɪnəf// UK //plˈeɪntɪf// plain·tiff
n. the person who starts a lawsuit against someone else in a court of law.
n. the party that initiates a civil legal action against another party. Used in formal legal contexts; contrasted with the defendant.
The plaintiff sued the company for damages.
The plaintiff presented evidence that the contract had been broken.
The plaintiff argued that the defendant's negligence directly caused the financial loss.
From Middle English plaintif, from Anglo-Norman, from Old French plaintif (“complaining”; as a noun, “one who complains, a plaintiff”) from the verb plaindre. Doublet of plaintive.