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xi Twit Definition of xi Share Definition of xi on Facebook Digg:Definition of xi! stumble Definition of xi Bookmark Definition of xi on Delicious submit Definition of xi to reddit Bookmark Definition of xi
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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