Where does “pro-” come from?

pro- (English) comes from Latin prō, from Latin ratus, from Latin rēōr, from Proto-Italic rēōr, from Proto-Indo-European h₂reh₁-, from Proto-Indo-European h₂er- — to fit, to fix, to put together.

pro- (English): agreeing with; supporting; favouring;...

Definitions

  1. agreeing with; supporting; favouring;...

Ancestry of “pro-”, step by step

pro- traces back through two separate lines of ancestry.

via Latin prō

StepLanguageWordMeaning
1Latinprōfor
2Latinratusconsidered, having been considered; established,...
3Latinrēōrto reckon, calculate
4Proto-Italicrēōrto reckon, to calculate; to think, to deem, to...
5Proto-Indo-Europeanh₂reh₁-to think, reason; to arrange
6Proto-Indo-Europeanh₂er-to fit, to fix, to put together

via Ancient Greek πρό

StepLanguageWordMeaning
1Ancient Greekπρόbefore; before, in front, forth, forward; before,...

Words derived from “pro-

Every word from Proto-Indo-European h₂er-
pro- — Etymology, Origin & Word History | Etymology Explorer