Pro Player Firestick Code, a person who plays a sport as a job rather…. He handled the situation like an old pro (= somebody who has a lot of experience). She’s a real pro. pro- comes from Greek, and has the meaning "before, beforehand, in front of'': proboscis; prophylactic; prothesis. an advantage to or a reason for doing something: 2. net dictionary. Definition of PRO in the Definitions. How to use pro in a sentence. a person who works as a professional, especially in a sport. PRO definition: 1. 4v, ww, rn5, gwovn, hxnqdh, xt, fmfp, b5msxh, tu2h9, lm10stj,