Lighting

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Old English lēoht, līht (noun and adjective), līhtan (verb), of Germanic origin; related to Dutch licht and German Licht, from an Indo-European root shared by Greek leukos ‘white’ and Latin lux ‘light’.

wiktionary

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light +‎  -ing

etymonline

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lighting (n.)

"shining, illumination," Old English lihting "shining, illumination; dawn; lightning," from leoht (see light (n.)).