Noah Webster's New International Dictionary of the English Language

1. (a.) Being within any limits, enclosure, 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. (a.) Remote from the limits, frontier, or shore; inland; as, the interior parts of a region or country.

3. (n.) That which is within; the internal or inner part of a thing; the inside.

4. (n.) The inland part of a country, state, or kingdom.