# illumination

/ˌɪˌɫuməˈneɪʃən/ (US) · /ɪlˌuːmɪnˈeɪʃən/ (UK)

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

## Senses

### 1. physical light

noun · CEFR B2 · Formal

the light that comes from a source, or the act of lighting up a place.

For teachers: the act of supplying with light or the state of being illuminated by a source.

- The street lamps provided just enough illumination to see the path ahead.
- The architect relied on natural illumination from the skylights to reduce the building's dependence on electrical systems during the day.

Usage: Uncountable when referring to the state of being lit; countable when referring to a specific source of light.

### 2. understanding or clarity

noun · CEFR C1 · Academic · Formal

the act of making something clear or easy to understand.

For teachers: the process of making something clear or providing intellectual or spiritual enlightenment.

- The lecture provided some illumination on the complex causes of the war.
- The philosopher sought spiritual illumination through years of silent meditation and rigorous study of ancient texts.

Usage: Usually uncountable in this figurative sense.

### 3. manuscript decoration

noun · CEFR C2 · Technical · Literary

the gold, silver, or bright colours used to decorate old handwritten books.

For teachers: the decoration of manuscripts or books with coloured illustrations, gold, or silver.

- The medieval Bible was famous for its beautiful gold illumination.
- Scholars examined the intricate illumination in the margins of the fourteenth-century manuscript to identify the specific workshop that produced it.

## Examples

- The street lamps provide enough illumination for a safe walk home.
- The architect used large windows to maximize natural illumination and reduce the building's energy consumption.
- The scholar's latest commentary provides much-needed illumination on the poet's more obscure metaphors, which have puzzled critics for decades.

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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.