definitions
  • synonyms

U, u

[ yoo ]
/ yu /
|

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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Definition for u (2 of 9)

U

[ yoo ]
/ yu /

pronoun Pronunciation Spelling.

you: Shoes Fixed While U Wait.

Definition for u (3 of 9)

U

[ oo ]
/ u /

noun

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

Definition for u (4 of 9)

U

[ yoo ]
/ yu /

adjective Informal.

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

Origin of U

u(pper class)

Definition for u (5 of 9)

U


Symbol.

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

Definition for u (6 of 9)

u.

1

Origin of u.

1
From the German word und

Definition for u (7 of 9)

Definition for u (8 of 9)

U.

1

Origin of U.

1
From the German word und

Definition for u (9 of 9)

U.

2

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for u

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)

U

1

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)

U

2
/ () /

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

Word Origin and History for u

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

Medicine 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.

Science definitions for u (1 of 2)

U


Abbreviation of uracil
The symbol for uranium.

Science definitions for u (2 of 2)

uranium

[ yu-rānē-əm ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.