illumination

noun

il·​lu·​mi·​na·​tion i-ˌlü-mə-ˈnā-shən 

1

: the action of illuminating or state of being illuminated: such as

a

: spiritual or intellectual enlightenment

b(1)

: a lighting up

the illumination of the room

(2)

: decorative lighting or lighting effects

c

: decoration by the art of illuminating

a medieval manuscript with magnificent illumination

2

: the luminous flux per unit area on an intercepting surface at any given point

3

: one of the decorative features used in the art of illuminating or in decorative lighting

Synonyms of illumination

• explanation
• interpretation
• illustration

Examples of illumination in a Sentence

When taking photographs indoors, use a flash for illumination.

They traveled to the temple in search of spiritual illumination.

an old manuscript with beautiful illuminations

Recent Examples on the Web

The holiday images will inspire window displays being rolled out worldwide, featuring a midnight-blue background decorated with Chinese lantern illuminations, trunks, the Vuitton family home in Asnières, and blossoming flowers and stars from the Monogram canvas motif. —Joelle Diderich, Footwear News, 7 Nov. 2025

Art and illumination Also on the first floor are the sun room, north parlor, library, and dining room. —Lennie Omalza, Louisville Courier Journal, 6 Nov. 2025

Using laser light of different colors, the Rice team studied how a two-layer Janus TMD—molybdenum sulfur selenide stacked on molybdenum disulfide—responded to illumination through a process called second harmonic generation (SHG). —Neetika Walter, Interesting Engineering, 4 Nov. 2025

Throughout the entire film, the light in the characters’ eyes, too… the Infinity Castle movie is a work of art that makes abundant use of torchlights and illumination. —Billboard Japan, Billboard, 28 Oct. 2025

Word History

Etymology

Middle English illumynacioun, borrowed from Medieval Latin illūminātiōn-, illūminātiō, going back to Latin, "illustriousness," from illūmināre "to give light to, illuminate entry 1" + -tiōn-, -tiō, suffix of verbal action

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for illumination

• abbreviation
• abomination
• acceleration
• accentuation
• accommodation
• accreditation
• acculturation
• accumulation
• acetylation
• adjudication
• administration
• adulteration

Kids Definition

illumination

noun

il·​lu·​mi·​na·​tion il-ˌü-mə-ˈnā-shən 

1

a

: the action of illuminating or state of being illuminated

b

: amount of light

2

: gold or colored decoration in a manuscript

Medical Definition

illumination

noun

il·​lu·​mi·​na·​tion il-ˌü-mə-ˈnā-shən 

1

: the action of supplying or brightening with light or the resulting state

2

: the luminous flux per unit area on an intercepting surface at any given point

called also illuminance

illuminate

il-ˈü-mə-ˌnāt 

transitive verb

illuminated; illuminating