There are 5 main definitions of u in English:

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u 1

Line breaks: u

abbreviation

Physics
Denoting quantum states or wave functions which change sign on inversion through the origin. The opposite of g.
[From German ungerade 'odd']

symbol

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(In units of measurement) micro- (10−6): direct read-out of concentration in ug or mg/l
[Substituted for mu]

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There are 5 main definitions of u in English:

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U 2 Line breaks: U
(also u)

noun (plural Us or U's)

1The twenty-first letter of the alphabet.
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

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There are 5 main definitions of u in English:

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U 3 Line breaks: U

abbreviation

1(In names of sports clubs) United: Oxford U
1.1British Universal (denoting films classified as suitable without restriction).
1.3 (also u) informal You: what will u do next?

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The chemical element uranium.

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There are 5 main definitions of u in English:

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U 4 Line breaks: U

adjective

British informal
(Of language or social behaviour) characteristic of or appropriate to the upper social classes: U manners

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).

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There are 5 main definitions of u in English:

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U 5 Line breaks: U

noun

A Burmese title of respect before a man’s name, equivalent to Mr: U Thien San

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Word of the day doofus
Pronunciation: ˈduːfʌs
noun
a stupid person