- The definition of a plaintiff is someone who brings a lawsuit against someone into court.
An example of a plaintiff is a wife filing for divorce.
a person who brings a suit into a court of law; complainant
Origin of plaintiffMiddle English plaintif ; from Old French mournful, making complaint ; from plaindre ; from plainte: see plaint
The party that institutes a suit in a court.
Origin of plaintiffMiddle English plaintif, from Anglo-Norman pleintif, from Old French plaintif, aggrieved; see plaintive.