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interior (EN)
adjective, noun

adjective “interior”

base form interior (more/most)
  1. situated on the inside; inner
    The interior walls of the old castle were damp and cold.
  2. located away from the coast or borders; inland
    They moved to an interior town to escape the busy life of the city.

noun “interior”

singular interior, plural interiors
  1. the inside part of something, especially a building or vehicle
    The interior of the house was beautifully decorated with paintings and sculptures.
  2. the central area of a country, away from the coast or borders
    The explorers ventured deep into the interior in search of new species.
  3. (in mathematics) the set of points within a shape or area, excluding the boundary
    The interior of a closed interval is the corresponding open interval.