# interior

/ˌɪnˈtɪɹiɝ/ (US) · /ɪntˈiəɹɪɐ/ (UK)

Source: https://englishreference.com/word/interior
Updated: 2026-08-15

## Senses

### 1. inside of a structure

noun · CEFR B2

the inside part of a building, room, or vehicle.

For teachers: the internal part of a building, container, or other enclosed structure, often in relation to its design or decoration.

- The interior of the old church was decorated with beautiful gold paintings.
- The architect focused on the interior of the cathedral, ensuring that the vaulted ceilings and stained glass created a sense of immense space.

### 2. inland region

noun · CEFR C1 · Formal

the part of a country that is far away from the coast or the borders.

For teachers: the central or inland regions of a country or continent, situated away from the maritime borders or frontiers.

- It took the explorers months to travel from the coast into the country's interior.
- Economic development in the nation's interior has lagged behind the coastal cities due to the lack of reliable transport infrastructure.

### 3. mathematical set

noun · CEFR C2 · Technical

the set of all points inside a specific boundary.

For teachers: the set of all interior points of a given set; points that do not belong to the set's boundary.

- In geometry class, we learned how to identify the interior of a circle.
- The theorem requires the function to be continuous on the closure of the set and differentiable on its interior.

### 4. internal

adjective · CEFR B2

located on the inside of something.

For teachers: situated within or relating to the inside of something; internal.

- The car has interior lights that turn on when you open the door.
- The interior walls of the spacecraft were lined with specialized insulation to protect the crew from extreme temperature fluctuations.

### 5. inland

adjective · CEFR C1 · Formal

describing a place that is far from the sea.

For teachers: remote from the coast or frontier; situated in the inland part of a territory.

- The interior parts of the continent are much hotter than the coastal areas.
- The interior tribes remained isolated from European trade for decades longer than those living along the Atlantic seaboard.

## Examples

- The interior of the house is painted bright white.
- Designers spent months selecting the leather and wood finishes for the luxury car's interior.
- While the building's facade remains strictly traditional, the interior has been completely gutted and replaced with a minimalist, open-plan office space.

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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.