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.