Internal  adj. 1 of or situated in the inside or invisible part. 2 of the inside of the body (internal injuries). 3 of a nation's domestic affairs. 4 (of a student) attending a university etc. As well as taking its examinations. 5 used or applying within an organization. 6 a intrinsic. B of the mind or soul.  internality n. Internally adv. [medieval latin internus internal]