pro
     adj : in favor of (an action or proposal etc.); "a pro vote" [ant:
            {anti}]
     n 1: an athlete who plays for pay [syn: {professional}] [ant: {amateur}]
     2: an argument in favor of a proposal [ant: {con}]
     adv : on the affirmative side [ant: {con}]
Source: WordNet® 2.0

PRO
     Precision RISC Organization (org.)
     
     
Source: Virtual Entity of Relevant Acronyms