1. The outer or the topmost boundary of an object. 2. A material layer constituting such a boundary. 3. The boundary of a three-dimensional figure. 4. The two-dimensional locus of points located in three-dimensional space. 5. A portion of space having length and breadth but no thickness. 6. Frank Conroy 7. An airfoil. 8. surface algae in the water. 9. Superficial. 10. Apparent as opposed to real. 11. We used asphalt to surface over the driveway. 12. surface a road. 13. To provide with a surface. 14. To rise to the surface. 15. To emerge after concealment. 16. To work or dig a mine at or near the surface of the ground. 17. a soldier who, on the surface, appeared brave and patriotic.