lux - WordReference.com Dictionary of English

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lux

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Concise Oxford English Dictionary © 2008 Oxford University Press:
lux /lʌks/ (abbrev.: lx)

▶noun (pl. same) the SI unit of illuminance, equal to one lumen per square metre.

– origin C19: from L., lit. ‘light’.

'lux' also found in these Oxford entries:

lucid - Lucifer - lucite - luculent - lx

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