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.
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pro- comes from Greek, and has the meaning "before, beforehand, in front of'': proboscis; prophylactic; prothesis. pro- is also attached to a word and means "primitive or early form'': prodrug; prosimian.
In some words, as proconsul, proprætor, pronoun, etc., it is properly the preposition (Latin pro, for, instead of). noun A Latin preposition occurring in several phrases used in English.