1. 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.
2. a prefix of priority in space or time having especially a meaning of advancing or projecting forward or outward, and also used to indicate substitution, attached widely to stems not used as words: provision; prologue; proceed; produce; protract; procathedral; proconsul.
[ pro-, pro-, comb. form repr. pro PRO 1 ]
a prefix identical in meaning with pro- 1 , occurring in words borrowed from Greek ( prodrome ) or formed of Greek (and occasionally Latin) elements.
[ pró for, before; see PRO 1 ]