linern.1. One who lines, as, a liner of shoes or clothing.()2. An airplane or ship belonging to a transportation company;()3. (Mach.) A thin piece placed between two parts to hold or adjust them, fill a space, etc.; a shim.()4. (Steam Engine) A lining{2}.()5. A slab on which small pieces of marble, tile, etc., are fastened for grinding.()6. (Baseball) A ball which, when struck, flies through the air in a nearly straight line not far from the ground; also called line drive; as, he hit a sharp liner to right.()7. A protective envelope for a phonograph record or other object.()8. A lining; as, a removable coat liner.()9. Same as eyeliner.()