Re: "Scientology's Lawyers threaten Anonymous" Perhaps it is a distinction without a difference? looks like same def but different latin tense Pro Se legal definition of Pro Se. Pro Se synonyms by the Free Online Law Dictionary. pro per adj. short for "propria persona," which is Latin for "for oneself," usually applied to a person who represents himself/herself in a lawsuit rather than have an attorney. (See: in pro per, in propria persona, propria persona) pro se (proh say) prep. Latin for "for himself". A party to a lawsuit who represents himself (acting in propria persona), is appearing in the case "pro se." (See: in propria persona) The actual definition of pro-se = "when I mentioned $cientology, all the lawyers hid under their desks"