Where does “pro-” come from?

pro- (Italian) 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- (Italian): forth; in favour or on behalf of

Definitions

  1. forth; in favour or on behalf of

Ancestry of “pro-”, step by step

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

Words derived from “pro-

Every word from Proto-Indo-European h₂er-