Where does “pro” come from?

pro (Czech) comes from Old Czech pro, from Proto-Slavic *pro, from Proto-Balto-Slavic *pra, from Proto-Indo-European pró, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

pro (Czech): API + "accusative"; for; pro

Definitions

  1. API + "accusative"; for; pro

Ancestry of “pro”, step by step

pro traces back through two separate lines of ancestry.

via Old Czech pro

StepLanguageWordMeaning
1Old Czechpro—
2Proto-Slavic*profor
3Proto-Balto-Slavic*pra—
4Proto-Indo-Europeanprótoward, leading to
5Proto-Indo-Europeanper-before, in front; first; to go through
6Proto-Indo-Europeanpr̥tóspassed , crossed

via Czech prosinec

StepLanguageWordMeaning
1CzechprosinecDecember
2Proto-Slavicprosìnьcьfirst month after Winter solstice (corresponds to December or January)

Words derived from “pro”

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European pró →