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U, u

[yoo] /yu/
noun, plural U's or Us, u's or us.
1.
the 21st letter of the English alphabet, a vowel.
2.
any spoken sound represented by the letter U or u, as in music, rule, curious, put, or jug.
3.
something having the shape of a U .
4.
a written or printed representation of the letter U or u.
5.
a device, as a printer's type, for reproducing the letter U or u.

U

[yoo] /yu/
pronoun, Pronunciation Spelling.
1.
you :
Shoes Fixed While U Wait.

U

[yoo] /yu/
adjective, Informal.
1.
characteristic of or appropriate to the upper class, especially of Great Britain.
Origin
u(pper class)

U

[oo] /u/
noun
1.
a Burmese title of respect applicable to a man: used before the proper name.

U

Symbol.
1.
(on a packaged product) certified as kosher by the Union of Orthodox Hebrew Congregations.
2.
the 21st in order or in a series, or, when I is omitted, the 20th.
3.
Chemistry, uranium.
4.
Biochemistry, uracil.
5.
Thermodynamics, internal energy.
6.
British. a designation for motion pictures determined as being acceptable for viewing by all age groups.
Compare A (def 11), X (def 9).

U.1

1.
and.
Origin
< German und

U.2

1.
2.
3.
4.
unit.
5.
8.

u.1

1.
and.
Origin
< German und

u.2

1.
2.
unit.
4.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for u
  • The predominant letter in the ending forms of this declension is u.
British Dictionary definitions for u

u

/juː/
noun (pl) u's, U's, Us
1.
the 21st letter and fifth vowel of the modern English alphabet
2.
any of several speech sounds represented by this letter, in English as in mute, cut, hurt, sure, pull, or minus
3.
  1. something shaped like a U
  2. (in combination): a U-bolt, a U-turn

U1

symbol
1.
united
2.
unionist
3.
university
4.
(in Britain)
  1. universal (used to describe a category of film certified as suitable for viewing by anyone)
  2. (as modifier): a U film
5.
(chem) uranium
6.
(biochem) uracil
abbreviation
7.
(text messaging) you
adjective
8.
(Brit, old-fashioned, informal) (esp of language habits) characteristic of or appropriate to the upper class Compare non-U

U2

//
noun
1.
a Burmese title of respect for men, equivalent to Mr

U.

abbreviation
1.
(maths) union
2.
unit
3.
united
4.
university
5.
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
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Word Origin and History for u

for historical evolution, see V. Used punningly for you by 1588 ["Love's Labour's Lost," V.i.60], not long after the pronunciation shift that made the vowel a homonym of the pronoun. As a simple shorthand (without intentional word-play), it is recorded from 1862. Common in business abbreviations since 1923 (e.g. U-Haul, attested from 1951).

Online Etymology Dictionary, © 2010 Douglas Harper
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u in Medicine

U 3

The symbol for the element uranium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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u in Science
U  
  1. Abbreviation of uracil

  2. The symbol for uranium.


uranium
  (y-rā'nē-əm)   
Symbol U
A heavy, silvery-white, highly toxic, radioactive metallic element of the actinide series. It has 14 known isotopes, of which U 238 is the most naturally abundant, occurring in several minerals. Fissionable isotopes, especially U 235, are used in nuclear reactors and nuclear weapons. Atomic number 92; atomic weight 238.03; melting point 1,132°C; boiling point 3,818°C; specific gravity 18.95; valence 2, 3, 4, 5, 6. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for u

u

up quark

U

  1. internal energy
  2. [residential] unit
  3. units
  4. uracil
  5. uranium
  6. you

u.

  1. unit
  2. units
  3. upper

U.

  1. uncle
  2. University
  3. unsatisfactory
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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