Of or pertaining to the inner surface, limit or boundary.
“The inside surface of the cup is unpainted.”
Nearer to the interior or centre of something.
“All the window seats were occupied, so she took an inside seat.”
noun
The left-hand side of a road if one drives on the left, or right-hand side if one drives on the right.
“On a motorway, you should never pass another vehicle on the inside.”
The side of a curved road, racetrack etc. that has the shorter arc length; the side of a racetrack nearer the interior of the course or some other point of reference.
“The car in front drifted wide on the bend, so I darted up the inside to take the lead.”