pro-, por- (Greek > Latin: before; forward; for, in favor of; in front of; in place of, on behalf of; used as a prefix).Before:portend: 
portent: 
procerebrum: 
prodigy: 
prodrome: 
profound: 
progenitor: 
progeny: 
progeria: 
progeria: 
prognosis: 
prognostic: 
prognosticate: 
prognostication: 
program: 
prologue: 
promise: 
promitosis: 
prophyllum: 
Forward:procedure: 
proceed: 
process: 
proclivity: 
procrastinate: 
procreate: 
prognathous: 
progress: 
progression: 
project: 
promote: 
promoter: 
propel: 
propensity: 
prospect: 
protractor: 
reciprocal: 
For, in favor of:pro bono publico: 
procure: 
proforma: 
prohydrotropism: 
proponent: 
proslavery: 
In front of:proboscis: 
proconsul: 
profane: 
profanity: 
prologue: 
pronoun: 
In place of, on behalf of:proconsul: 
pronoun: 
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