xi
[ zahy, sahy; Greek ksee ]
/ zaɪ, saɪ; Greek ksi /
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noun, plural xis.
the 14th letter of the Greek alphabet (Ξ, ξ).
the group of consonant sounds represented by this letter.
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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”?
First appeared around 1750, and is related to the French word “braguette” for the name of codpiece armor.
First appeared in 1610, based on the French word “baguette” for the long loaf of bread.
First appeared in 1555, and is related to the French word “raquette” for a netted bat.
TAKE THE QUIZ TO FIND OUT Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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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.