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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.’
- 1.1Astronomy followed by Latin genitive The fourteenth star in a specified constellation.‘Xi Cygni’
- ‘The highlight for me that night was Xi Bootes. This colorful double lies about 8 degrees east of Arcturus.’
- 1.1Astronomy followed by Latin genitive The fourteenth star in a specified constellation.
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