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  1. U
    IPA[yo͞o]
  2. noun

    • 1. the twenty-first letter of the alphabet.

    • 2. denoting the next after T in a set of items, categories, etc.

    • 3. a shape like that of a capital U, especially a cross section:

      U-shaped glaciated valleys
  3. Variation

    • n.: noun: U, plural noun: U's

  4. u

    • abbreviation

      denoting quantum states or wave functions which change sign on inversion through the origin.
    • symbol

      (in units of measurement) micro- (106):

    U

    • abbreviation

      you:
    • symbol

      the chemical element uranium.

    U

    • noun

      a Burmese title of respect before a man's name, equivalent to Mr:

    U

    • adjective

      (of language or social behavior) characteristic of or appropriate to the upper social classes:

    U

    • abbreviation

      (in names of sports clubs) United:

      universal (denoting films classified as suitable without restriction).

    • symbol

      the chemical element uranium.

    U

    • noun

      the twenty-first letter of the alphabet.

      denoting the next after T in a set of items, categories, etc.

    u

    • abbreviation

      denoting quantum states or wave functions which change sign on inversion through the origin.
    • symbol

      (in units of measurement) micro- (10−6):

    U

    • adjective

      (of language or social behaviour) characteristic of or appropriate to the upper social classes:

    U

    • noun

      a Burmese title of respect before a man's name, equivalent to Mr:
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