Dictionary.com

xi

[ zahy, sahy; Greek ksee ]
/ zaɪ, saɪ; Greek ksi /
Save This Word!

noun, plural xis.

the 14th letter of the Greek alphabet (Ξ, ξ).
the group of consonant sounds represented by this letter.

QUIZZES

QUIZ YOURSELF ON PARENTHESES AND BRACKETS APLENTY!

Set some time apart to test your bracket symbol knowledge, and see if you can keep your parentheses, squares, curlies, and angles all straight!
Question 1 of 7
Let’s start with some etymology: What are the origins of the typographical word “bracket”?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for xi

British Dictionary definitions for xi (1 of 2)

xi
/ (zaɪ, saɪ, ksaɪ, ksiː) /

noun plural xis

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

British Dictionary definitions for xi (2 of 2)

Xi

Hsi or Si

/ (ʃiː) /

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)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for xi (1 of 2)

xi
[ zī, sī, ksē ]

n.

The 14th letter of the Greek alphabet.

Medical definitions for xi (2 of 2)

ξ

The Greek letter xi. Entries beginning with this character are alphabetized under xi.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
See Today's Synonym