A party to a lawsuit; SYN. litigator.

ETYM French plaintif making complaint, plaintive; in Old French equiv. to plaignant complainant, prosecutor, from plaindre. Related to Plaint, Plaintive.
A person who brings an action in a court of law; SYN. complainant.
In law, a person who brings a civil action in a court of law seeking relief (for example, damages).