The CONCACAF Champions League is organized by CONCACAF.
In mathematics , a primitive root may mean either. mathematics. mathematics. a primitive root modulo n in modular arithmetic , or. primitive root modulo n. primitive root modulo n. modular arithmetic. modular arithmetic. a primitive nth root of unity amongst the solutions of xn = 1 in a field. primitive nth root of unity. primitive nth root of unity. field. field ( mathematics )