An Etymological Dictionary of Astronomy and Astrophysics

1. To be of the same opinion; agree.
   

   2. To act together to a common object or effect.

Etymology (EN): From L. concurrere “to run together, assemble hurriedly; fight,” from → com- “together” + currere “to run.”

Etymology (PE): Hâtazidan, from hâ-, variant of ham- “together,” → com-, + taz-, variant of tâz-, tâxtan “to run; to hasten; to assault,” → flow.