Definitions
xi Tweet Definition of xi Like Definition of xi on Facebook
noun 
  1. The name for the 14th letter of Classical Greek, Classical and Modern Greek. The 15th in Ancient Greek, Ancient and Old Greek.
  2. (particles) Either of a pair of hyperons having spin 1/2, which decay into a lambda particle and a pion.
Etymology: From Ancient Greek (polytonic, á, á).


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