SURFACE Definition & Meaning – Merriam-Webster

Definition of Surface

The word surface primarily refers to two related concepts:

  1. The exterior or upper boundary of an object or body.
    Examples include:

    • on the surface of the water
    • the earth's surface
  2. A plane or curved two-dimensional locus of points.

The surface marks the visible or tangible outer layer defining the shape or extent of something.


Author's summary:
The term "surface" denotes the outermost layer of an object or a two-dimensional shape outlining its boundary.

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Merriam-Webster Merriam-Webster — 2025-11-29

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