Where does “por” come from?

por (Old Spanish) comes from Vulgar Latin por, 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.

Ancestry of “por”, step by step

StepLanguageWordMeaning
1Vulgar Latinporfor
2Latinprōfor
3Latinratusconsidered, having been considered; established,...
4Latinrēōrto reckon, calculate
5Proto-Italicrēōrto reckon, to calculate; to think, to deem, to...
6Proto-Indo-Europeanh₂reh₁-to think, reason; to arrange
7Proto-Indo-Europeanh₂er-to fit, to fix, to put together

Words derived from “por

Every word from Proto-Indo-European h₂er-Every word from Proto-Indo-European h₂reh₁-Every word from Proto-Italic rēōr