отборselectio [onis, f];
мнениеopinio [onis, f]
средаmedium [ii, n];
magister [tri, m];praeceptor [oris, m];professor [oris, m];doctor [oris, m];institutor [oris, m];instructor [oris, m];exercitator [oris, m] [exercitor](alicujus rei);