Main definitions of u in English

: u1U2U3U4U5

u1

abbreviation

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

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

    ‘direct readout of concentration in ug or mg/l’

Pronunciation

u

/juː/

Main definitions of U in English

: u1U2U3U4U5

U2

(also u)

Pronunciation /yo͞o/ /ju/

nounUs, U's

  • 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.
  • 2"U"A shape like that of a capital U, especially a cross section.

    in combination ‘U-shaped glaciated valleys’

Pronunciation

U

/yo͞o/ /ju/

Main definitions of U in English

: u1U2U3U4U5

U3

(also u)

Pronunciation /yo͞o/ /ju/

abbreviation

informal
  • You.

    ‘what will u do next?’

  • The chemical element uranium.

Pronunciation

U

/yo͞o/ /ju/

Main definitions of U in English

: u1U2U3U4U5

U4

Pronunciation /yo͞o/ /ju/

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

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).

Pronunciation

U

/yo͞o/ /ju/

Main definitions of U in English

: u1U2U3U4U5

U5

Pronunciation /o͞o/ /u/

noun

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

    ‘U Thien San’

Pronunciation

U

/o͞o/ /u/