Learner's definition of OUTER
always used before a noun
1 : located on or toward the outside of something: not on or at the inside or center of something
the city's outer limits
the planet's outer ring
the outer edges of the roof
The package's outer covering was damaged.
I removed the outer skin of the onion.
2 : of or relating to a person's body or physical appearance rather than to a person's mind or spirit