Meaning of xi in English:

noun

• 1The fourteenth letter of the Greek alphabet (Ξ, ξ), transliterated as ‘x’.

  ‘This page displays the Greek alphabet and gives information on pronunciation for both ... y as in yet, and before gamma, kappa, xi, or chi.’

  ‘While having no Latin derivative, the Xi was adopted into the early Cyrillic alphabet, as the letter ksi.’

  1. 1.1Astronomy followed by Latin genitive The fourteenth star in a specified constellation.
     ‘Xi Cygni’
     More example sentences

     • ‘The highlight for me that night was Xi Bootes. This colorful double lies about 8 degrees east of Arcturus.’