in·ter·nal / inˈtərnl/ • adj. of or situated on the inside: the tube had an internal diameter of 1.1 mm. ∎  inside the body: internal bleeding. ∎  existing or occurring within an organization: an internal telephone system. ∎  relating to affairs and activities within a country rather than with other countries; domestic: the government's internal policies internal flights. ∎  experienced in one's mind; inner rather than expressed: internal feelings. ∎  of the inner nature of a thing; intrinsic: he creates a dialogue internal to his work.• pl. n. (internals) inner parts or features: all the weapon's internals are well finished and highly polished.DERIVATIVES: in·ter·nal·i·ty / ˌintərˈnalitē/ n.in·ter·nal·ly adv.

internal XVI. f. contemp. †intern or its source, L. internus; see prec., -AL1.