Etymology of the Latin word cognoscens
the Latin word cognoscens (acquainted with; aware of; judge; inquisitor; one taking part)
derived from the Latin word cognoscere (to know; become acquainted with, aware of; recognize)
using the Latin prefix co-
derived from the Latin word gnoscere (to recognize; examine, study, inspect; get to know; learn, find out)
derived from the Proto-Indo-European root *gnō-