Confocal :: Confocal (a.) Having the same foci; as, confocal quadrics..
Focal :: Focal (a.) Belonging to,or concerning, a focus; as, a focal point..
Focalization :: Focalization (n.) The act of focalizing or bringing to a focus, or the state of being focalized..
Focalize :: Focalize (v. t.) To bring to a focus; to focus; to concentrate.