Internal (?), a. [L. internus; akin to interior. See Interior.]
[1913 Webster]

1. Inward; interior; being within any limit or surface; inclosed; -- opposed to external; as, the internal parts of a body, or of the earth.
[1913 Webster]

2. Derived from, or dependent on, the thing itself; inherent; as, the internal evidence of the divine origin of the Scriptures.
[1913 Webster]

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.
[1913 Webster]

4. Pertaining to the inner being or the heart; spiritual.
[1913 Webster]

With our Savior, internal purity is everything. Paley.
[1913 Webster]

5. Intrinsic; inherent; real. [R.]
[1913 Webster]

The internal rectitude of our actions in the sight of God. Rogers.
[1913 Webster]

6. (Anat.) Lying toward the mesial plane; mesial.
[1913 Webster]

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.

Syn. -- Inner; interior; inward; inland; inside.
[1913 Webster]