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standard candle

noun
  1. a unit of luminous intensity; the candela: not in scientific usage because of possible confusion with a former unit (international candle)See also candela, international candle
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012