Main definitions of U in English

: u1U2U3U4U5

U1

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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’

Pronunciation

U

/yo͞o/ /ju/

Main definitions of U in English

: u1U2U3U4U5

U2

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abbreviation

(also u)
informal
  • You.

    • ‘what will u do next?’

Pronunciation

U

/yo͞o/ /ju/

  • The chemical element uranium.

Pronunciation

U

/yo͞o/ /ju/

Main definitions of U in English

: u1U2U3U4U5

U3

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adjective

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

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

Pronunciation

U

/yo͞o/ /ju/

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 definitions of U in English

: u1U2U3U4U5

U4

Translate U into Spanish

noun

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

    • ‘U Thien San’

Pronunciation

U

/o͞o/ /u/

Main definitions of u in English

: u1U2U3U4U5

u5

Pronunciation /juː/

Translate u into Spanish

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 readout of concentration in ug or mg/l’

    Origin

    Substituted for mu.