The outside part, parts or surface of something.
"The painter spent all afternoon cleaning the exterior of the old house."
In plain English: Exterior means the outside part of something that you can see from the ground up.
"The exterior of the old house was covered in climbing vines."
situated in or suitable for the outdoors or outside of a building
"an exterior scene"
"exterior grade plywood"
"exterior paints"
Relating to the outside parts or surface of something.
"The building's exterior was painted a bright blue last summer."
In plain English: Exterior means being on the outside of something, like the part you can see from the outdoors rather than inside.
"The car's exterior looks shiny after being washed."
Usage: Use exterior as an adjective before nouns like walls or paint to describe their outer surfaces, while reserving the noun form for references to specific areas such as a building's exterior design. Avoid confusing it with interior, which strictly refers to inside parts rather than external ones.
The word comes from the Latin exterior, which originally meant "outer" or "external." It is derived from the prefix ex- meaning "out" and the root terius related to "third," though in this context it simply denotes something on the outside.