What does outer mean?
Outer describes something that lies on the outside of a larger object or extends beyond its centre. It is used for physical surfaces, such as the outer wall of a building, the outer layer of an onion, or the outer edge of a path. In descriptions of clothing, an outer garment is one worn over other clothes, often to provide protection from weather. The word can also mean farther away from a central or enclosed area, as in “the outer regions.” Outer is especially familiar from the established phrase “outer space,” referring to the region beyond the Earth's atmosphere. Its ordinary opposite is inner, but in some contexts internal may be more appropriate. As a noun, outer can refer to an outer garment or to the external part of something, though these uses are less common than the adjective.
Situated on, belonging to, or forming the external part of something.
"The outer shell of the egg protects the contents inside."
Common in general English, particularly for clothing, physical objects, geographical areas, and space.
An outer garment, especially a coat or jacket, or the external part of something.
"He put on his outer and hurried into the rain."
The clothing sense is chiefly British and often informal; the external-part sense is more formal and less common.
Plural outers is used for multiple outer garments or other external parts.
"The children wore warm outers during the walk."
Many everyday meanings of outer are defined by contrast: an outer layer covers an inner one, while the outer edge surrounds the inner part.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does outer come from?
Outer comes from Old English ūtera, an adjective formed from ūt, meaning “out” or “outside.” The development reflects the common comparative pattern in which an older form was gradually replaced by one using the more productive -er suffix, alongside words such as upper and lower. Outer is related to other English words preserving the same basic idea of being beyond or outside.
Related word forms
How outer is actually used
The adjective is common in general English. In clothing, “outer” often means the garment worn over other clothing; in scientific and geographical contexts, it is especially common in phrases such as “outer space” and “outer atmosphere.”
Easily confused with outer
Outer means the exterior or outside of something, whereas inner means the part that is enclosed or nearer its centre.