In·te·ri·or a.
 1. Being within any limits, inclosure, or substance; inside; internal; inner; -- opposed to exterior, or superficial; as, the interior apartments of a house; the interior surface of a hollow ball.
 2. Remote from the limits, frontier, or shore; inland; as, the interior parts of a region or country.
 Interior angle Geom., an angle formed between two sides, within any rectilinear figure, as a polygon, or between two parallel lines by these lines and another intersecting them; -- called also internal angle.
 Interior planets Astron., those planets within the orbit of the earth.
 Interior screw, a screw cut on an interior surface, as in a nut; a female screw.
 Syn: -- Internal; inside; inner; inland; inward.


 In·tern·al a.
 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. [R.]
    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.
 Syn: -- Inner; interior; inward; inland; inside.

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 internal angle
      n : the angle inside two adjacent sides of a polygon [syn: {interior
          angle]