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The Collaborative International Dictionary of English v.0.48 (gcide)

Internal \In*tern"al\, a. [L. internus; akin to interior. See
{Interior}.]
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1. Inward; interior; being within any limit or surface;
inclosed; -- opposed to {external}; as, the internal parts
of a body, or of the earth.
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2. Derived from, or dependent on, the thing itself; inherent;
as, the internal evidence of the divine origin of the
Scriptures.
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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.
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4. Pertaining to the inner being or the heart; spiritual.
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With our Savior, internal purity is everything.
--Paley.
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5. Intrinsic; inherent; real. [R.]
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The internal rectitude of our actions in the sight
of God. --Rogers.
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6. (Anat.) Lying toward the mesial plane; mesial.
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{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] Internal-combustion