internala.[L. internus; akin to interior. See Interior.]()1. Inward; interior; being within any limit or surface; inclosed; -- opposed to external; as, the internal parts of a body, or of the earth.()2. Derived from, or dependent on, the thing itself; inherent; as, the internal evidence of the divine origin of the Scriptures.()3. Pertaining to its own affairs or interests; especially, (said of a country) domestic, as opposed to foreign; as, internal trade; internal troubles or war.()4. Pertaining to the inner being or the heart; spiritual.()With our Savior, internal purity is everything. (Paley.)5. Intrinsic; inherent; real.()The internal rectitude of our actions in the sight of God. (Rogers.)()6. (Anat.) Lying toward the mesial plane; mesial.()Internal angle (Geom.), an interior angle. See under Interior. -- Internal gear (Mach.), a gear in which the teeth project inward from the rim instead of outward.()()