An Etymological Dictionary of Astronomy and Astrophysics

1. To happen; take place; come to pass.
   

2. To be found or be present; exist.

Etymology (EN): M.Fr. occurrer “to happen unexpectedly” or directly from L. occurrere “run to meet, run against, present itself,” from ob “against, toward” + currere “to run,” → current.

Etymology (PE): Roxdâdan, literally “to appear,” from rox “appearance; aspect; face,” variant ruy “face, surface” + dâdan “to give,” → event.