Main meanings of u in English

: u1U2U3U4U5

u1

Pronunciation /juː/

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abbreviation

Physics
  • Denoting quantum states or wave functions which change sign on inversion through the origin.

    The opposite of g

    Origin

    From German ungerade ‘odd’.

in combination
  • (in units of measurement) micro- (10⁻⁶)

    • ‘direct read-out of concentration in ug or mg/l’

    Origin

    Substituted for mu.

Main meanings of U in English

: u1U2U3U4U5

U2

Pronunciation /juː/

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nounplural noun Us, plural noun U's

(also u)
  • 1The twenty-first letter of the alphabet.

    not in service, unavailable for use, not in use, out of action, unserviceable
    1. 1.1Denoting the next after T in a set of items, categories, etc.
  • 2UA shape like that of a capital U, especially a cross section.

    • ‘U-shaped glaciated valleys’

Main meanings of U in English

: u1U2U3U4U5

U3

Pronunciation /juː/

Translate U into Spanish

abbreviation

  • 1(in names of sports clubs) United.

    • ‘Oxford U’
  • 2British Universal (denoting films classified as suitable without restriction).

  • 3Uruguay (international vehicle registration).

  • 4

    (also u)
    informal You.

    • ‘what will u do next?’

  • The chemical element uranium.

Main meanings of U in English

: u1U2U3U4U5

U4

Pronunciation /juː/

Translate U into Spanish

adjective

informal British
  • (of language or social behaviour) characteristic of or appropriate to the upper social classes.

    • ‘U manners’
    upper-class, aristocratic, upmarket, Home Counties

Origin

1950s abbreviation of upper class; coined in 1954 by Alan S. C. Ross, professor of linguistics, the term was popularized by its use in Nancy Mitford's Noblesse Oblige (1956).

Main meanings of U in English

: u1U2U3U4U5

U5

Pronunciation /uː/

Translate U into Spanish

noun

  • A Burmese title of respect before a man's name, equivalent to Mr.

    • ‘U Thien San’