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• xi
  xi

  noun

  the 14th letter of the Greek alphabet (Ξ, ξ).
• Xi
  Xi

  noun

  a river in S China, rising in Yunnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)

xi

American  

[zahy, sahy, ksee] / zaɪ, saɪ, ksi /

noun

xis plural

1. the 14th letter of the Greek alphabet (Ξ, ξ).

2. the group of consonant sounds represented by this letter.

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Xi ¹ British  

/ ʃiː /

noun

1. a river in S China, rising in Yunnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)

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xi ² British  

/ ksaɪ, saɪ, ksiː, zaɪ /

noun

1. the 14th letter in the Greek alphabet (Ξ, ξ), a composite consonant, transliterated as x

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Other Word Forms

Noun Inflected Forms

• xis
  plural

Example Sentences

During the group-stage draw against Brazil, Morocco became the first team in World Cup history to field an entire starting XI born abroad.

From BBC • Jun. 29, 2026

XI, is set to become the first pure play on humanoid robots to trade in the U.S.

From Barron's • Jun. 26, 2026

Wright said he was "surprised" Norway had made so many changes, particularly as they named the same starting XI for wins over Iraq and Senegal.

From BBC • Jun. 26, 2026

Churchill Capital Corp XI surged 23% to $12.77 on Wednesday.

From Barron's • Jun. 24, 2026

XI Darlene cut her picture out of the paper and put it on the kitchen table.

From "A Confederacy of Dunces" by John Kennedy Toole