1. located on the outside or farther from the center
2. being the part that is away from the middle

Examples

• The outer layer of the onion was brown and papery.
• She removed her outer jacket when she came inside.
• The outer planets of our solar system are much colder.
• The outer walls of the castle were heavily fortified.
• He lived in the outer suburbs of the city.
• The outer ring of seats had the worst view.
• The outer edge of the circle was marked in red.