The inside of a building, container, cavern, or other enclosed structure.

The inside regions of a country, distanced from the borders or coasts.

“Sir Richard Burton explored far into the African interior.”

The set of all interior points of a set.

Within any limits, enclosure, or substance; inside; internal; inner.

“the interior apartments of a house; the interior surface of a hollow ball”

Remote from the limits, frontier, or shore; inland.

“the interior parts of a region or country”