always used before a noun
1
a
: located on the inside of something
an interior [=inner] surface
a large car with lots of interior room
interior walls
b
: suited for use in the inside or on inside surfaces
interior paint
interior lights
2
: occurring in the mind
interior [=(more commonly) inner] thoughts
an interior monologue [=a section of a novel, story, or play in which a character's inner thoughts are expressed]
plural interiors
1
: an inner part, area, or surface
a black car with gray leather interior
the interior of the house
2
: the part of a country that is far from the coast
They traveled deep into the interior of Australia.
3
: the events and activities of a country that involve the country itself rather than foreign countries
Secretary of the Interior
Cite this Entry
“Interior.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/interior. Accessed 16 Jun. 2026.
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