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U

1

or u

[ yoo ]
/ yu /
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noun, plural U's or Us, u's or us.
the 21st letter of the English alphabet, a vowel.
any spoken sound represented by the letter U or u, as in music, rule, curious, put, or jug.
something having the shape of a U.
a written or printed representation of the letter U or u.
a device, as a printer's type, for reproducing the letter U or u.
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ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
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Other definitions for U (2 of 9)

U2
[ yoo ]
/ yu /

pronoun Informal.
you: Shoes Fixed While U Wait.

Origin of U

2
First recorded in 1840–45

Other definitions for U (3 of 9)

U3
[ yoo ]
/ yu /

adjective Informal.
characteristic of or appropriate to the upper class, especially of Great Britain.

Origin of U

3
First recorded in 1950–55; u(pper class)

Other definitions for U (4 of 9)

U4
[ oo ]
/ u /

noun
a Burmese title of respect applicable to a man: used before the proper name.

Origin of U

4
First recorded in 1930–35; from Burmese ʔú, roughly “Mister, Uncle,” used for senior men and monks

Other definitions for U (5 of 9)

U5

Symbol.
(on a packaged product) certified as kosher by the Union of Orthodox Hebrew Congregations.
the 21st in order or in a series.
Chemistry. uranium.
Biochemistry. uracil.
Thermodynamics. internal energy.
British. a designation for motion pictures determined as being acceptable for viewing by all age groups.Compare A3 (def. 10), AA2 (def. 5), X3 (def. 9).

Other definitions for U (6 of 9)

u.1

abbreviation
and.

Origin of u.

1
From the German word und

Other definitions for U (7 of 9)

u.2

abbreviation
uniform.
unit.
unsatisfactory.
upper.

Other definitions for U (8 of 9)

U.1

abbreviation
and.

Origin of U.

1
From the German word und

Other definitions for U (9 of 9)

U.2

abbreviation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use U in a sentence

British Dictionary definitions for U (1 of 4)

u

U

/ (juː) /

noun plural u's, U's or Us
the 21st letter and fifth vowel of the modern English alphabet
any of several speech sounds represented by this letter, in English as in mute, cut, hurt, sure, pull, or minus
  1. something shaped like a U
  2. (in combination)a U-bolt; a U-turn

British Dictionary definitions for U (2 of 4)

U1

symbol for
abbreviation for
text messaging you
adjective
British old-fashioned, informal (esp of language habits) characteristic of or appropriate to the upper classCompare non-U

British Dictionary definitions for U (3 of 4)

U2
/ () /

noun
a Burmese title of respect for men, equivalent to Mr

British Dictionary definitions for U (4 of 4)

U.

abbreviation for
maths union
unit
united
university
upper
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 U

U

The symbol for the elementuranium
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for U

U

Abbreviation of uracil
The symbol for uranium.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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