Definition of Pro se

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Pro se Definition from Arts & Humanities Dictionaries & Glossaries
JM Latin-English Dictionary
On one's own behalf
Pro se Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Pro se legal representation means advocating on one's own behalf before a court, rather than being represented by a lawyer. This may occur in any court proceeding, whether one is the defendant or plaintiff in civil cases, and when one is a defendant in criminal cases. Pro se is a Latin phrase meaning "for oneself" or "on one's own behalf". This status is sometimes known as propria persona (abbreviated to "pro per"). In England and Wales the comparable status is that of "litigant in person".

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Pro se Definition from Law Dictionaries & Glossaries
The 'Lectric 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. (2) Lat. for “you lose.” also pro per
Courtesy of the 'Lectric Law Library.
Duhaime.org Legal Dictionary
Latin: in one’s personal behalf. Contrast with pro socio. - (read more on Pro se)
  
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Massachusetts Divorce Law Dictionary
When a party handles his or her own case, i.e., represents himself or herself, she is said to appear "pro se."
USPTO Patent and Trademark Glossary
used to designate an independent inventor who has elected to file an application by themselves without the services of a licensed representative.

Context: Patent 
By the United States Patent and Trademark Office