An inner part.
"She gently rubbed her inner arm where the bite mark was hidden."
In plain English: An inner is someone who lives inside your body, like your heart or stomach.
"The inner spoke of the wheel was bent when I hit the curb."
Usage: Use "inner" only when referring specifically to the central or deepest section of something, such as an inner tube or the inner city. It is rarely used as a standalone noun in modern English unless preceded by a specific modifier like "the.
confined to an exclusive group
"privy to inner knowledge"
"inside information"
"privileged information"
exclusive to a center; especially a center of influence
"inner regions of the organization"
"inner circles of government"
Being or occurring (farther) inside, situated farther in, located (situated) or happening on the inside of something, situated within or farther within contained within something.
"She carefully wrapped a protective layer around the inner core of the fruit to keep it from bruising during transport."
In plain English: Inner means being on the inside of something rather than on the outside.
"She felt an inner peace after finishing her long journey."
Usage: Use "inner" to describe something positioned deeper within an object or space, such as the inner ring of a track or the inner lining of a coat. It specifically refers to location relative to an outer boundary rather than emotional states or abstract qualities.
The word inner comes from the Old English comparative form of "inne," meaning within. It traveled into modern English through Middle English to describe something located on or near the inside surface.