Pro Se

Representing oneself. Serving as one's own lawyer.

Additional Sources

Answers.com

For one's own behalf; in person. Appearing for oneself, as in the case of one who does not retain a lawyer and appears for himself or herself in court.

Law.com Dictionary

Latin for "for himself." A party to a lawsuit who represents himself (acting in propria persona) is appearing in the case "pro se."

Lect Law Library

Lat. "for himself" "on one's own behalf" A person who represents himself in court alone without the help of a lawyer is said to appear pro se.

Wikipedia

Pro se legal representation refers to the instance of a person representing himself or herself without a lawyer in a court proceeding, whether as a defendant or a plaintiff and whether the matter is civil or criminal. Pro se is a Latin phrase meaning "for oneself". This status is sometimes known as propria persona (abbreviated to "pro per"). In England and Wales the comparable status is "litigant in person". In the United States, many state court systems and the federal courts are experiencing an increasing proportion of pro se litigants. In the United States federal court system for the year 2007 approximately 27% of actions filed, 92% of prisoner petitions and 10% of non-prisoner petitions were filed by pro se litigants.