| 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. |
| a prefix identical in meaning with pro-1 , occurring in words borrowed from Greek (prodrome) or formed of Greek (and occasionally Latin) elements. |
| pro- 1 pref.
[Middle English, from Old French, from Latin pro-, prō-, from prō, for; see per1 in Indo-European roots.] |
| pro- 2 pref.
[Middle English, from Old French, from Greek, from pro, before, in front; see per1 in Indo-European roots.] |
pro- pref.
Earlier; before; prior to: progenitor.
Rudimentary: pronucleus.
Anterior; in front of: procephalic.
