# surface

/ˈsɝfəs/ (US) · /sˈɜːfɪs/ (UK)

Source: https://englishreference.com/word/surface
Updated: 2026-06-19

## Senses

### 1. outer layer

noun · CEFR B1

the outside part or top layer of something.

For teachers: the outermost boundary or exterior part of a physical object.

- The surface of the table was smooth and shiny after being polished.
- The probe landed successfully on the rocky surface of the asteroid, sending back high-resolution images of the terrain.

### 2. top of a liquid

noun · CEFR B1

the top part of a body of water or other liquid.

For teachers: the upper boundary of a liquid that is in contact with the atmosphere.

- A small leaf floated quietly on the surface of the pond.
- The submarine remained just below the surface to avoid detection by radar while maintaining visual contact through the periscope.

### 3. outward appearance

noun · CEFR B2

the way someone or something looks on the outside, which might be different from the truth.

For teachers: the external or superficial aspect of a person, situation, or thing as opposed to its underlying reality.

- On the surface, the plan seemed perfect, but it had many hidden problems.
- Beneath the calm surface of the diplomatic negotiations, both nations were preparing for the possibility of a total breakdown in communication.

### 4. mathematical shape

noun · CEFR C1 · Technical

a shape that has length and width but no thickness.

For teachers: the locus of an equation in a space of three or more dimensions, typically having two degrees of freedom.

- The teacher asked us to calculate the area of the curved surface.
- The researcher used complex algorithms to map the irregular surface of the manifold in four-dimensional space.

### 5. to rise up

verb · CEFR B2

to come up to the top of the water.

For teachers: to rise to the surface of a body of water from beneath.

- The whale surfaced to breathe before diving back into the deep ocean.
- After nearly an hour underwater, the divers finally surfaced near the support boat.

### 6. to become known

verb · CEFR B2

to appear or become public after being hidden.

For teachers: to emerge or become apparent after a period of being hidden or unknown.

- New evidence has surfaced that might change the result of the trial.
- Rumours of a corporate takeover began to surface shortly after the CEO announced her unexpected resignation.

### 7. on the outside

adjective · CEFR B2

relating to the outside or top layer of something.

For teachers: pertaining to or occurring on the exterior boundary of an object.

- The doctor treated the surface wound, but he was worried about internal injuries.
- The surface tension of the liquid allowed the insect to walk across the water without sinking.

Usage: Usually placed before a noun.

## Examples

- The surface of the table is smooth and cold.
- The divers returned to the surface of the water after exploring the coral reef for an hour.
- Geologists study the Earth's surface to understand how tectonic shifts and erosion have shaped the landscape over millions of years.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.