1. The outside part or uppermost layer of something.
2. A continuous set of points that has length and breadth but no thickness.
3. Relating to or found on the surface of something.
4. Rise or come up to the surface of the water or the ground.
5. Provide (something, especially a road) with a particular surface.
Plural noun: Surfaces.
Verb forms: Surface, Surfaced, Surfaced.
Fish is floating on the surface of the water.