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"lighting" is also used as a crossword clue. If that's what you saw, the answer is often illumination (12 letters).
Definitions
the act of setting something on fire
Word origin
From light + -ing.
Used in a sentence
“The acetylene gas lighting in the station offices and platforms at Kyle of Lochalsh recently has been replaced by electric lighting.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Illumination”8 letters
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