What does interior mean

The inner or internal part of something

Explanation:

If it is being used as a noun, that is the correct definition. If it is being used as an adjective (describing a noun), it is defined as, "lying, occurring, or functioning within the limited boundaries".

in·te·ri·or

/ˌinˈtirēər/

Adjective

situated within or inside; relating to the inside; inner.

"the interior lighting is not adequate"