The story
- Latin · derived fromparī
- Late Latin · derived frompari passu
- English todaypari passu
From Late Latin pari passu, from Latin parī, ablative of pār (“equal”) + passū, ablative of passus (“step”).
First known use, by meaning
- from 16th c. Simultaneously; likewise, equally.
Etymology from Wiktionary, CC BY-SA 4.0.