First Known Use of pro . Noun. 15th century, in the meaning defined at sense 1. Adverb. 15th century, in the meaning defined above. Preposition. 1817, in the meaning defined above. Noun or adjective Pro definition, in favor of a proposition, opinion, etc. See more. 1. a prefix, having anti-as its opposite, used to form adjectives that have the general sense “favoring” the group, interests, course of action, etc., denoted by the headword: pro -choice; pro -American; prowar.

Pro - definition, a prefix indicating favor for some party, system, idea, etc., without identity with the group ( pro -British; pro -Communist; proslavery), having anti- as its opposite. See more. pro -Prefix denoting forward, first, to, towards the front or preceding. It may or may not be a coincidence that hundreds of drug names, especially brand names, have this prefix. More than 50 of the names of those heremonly prescribed, start with ‘ pro -’ and the practice appears to be spreading to the naming of products outside pharmacology. Jan 06, 2019 German [] Preposition []. pro (+ accusative) . per; Usage notes []. When used with Latin words, the ablative is used as in pars pro toto or Pars pro Toto, and pro forma or pro Forma.