There are 5 main definitions of u in English:

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u 1

Pronunciation:

abbreviation

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

symbol

[in combination]
(In units of measurement) micro- (106): direct readout of concentration in ug or mg/l

Origin

Substituted for mu.

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There are 5 main definitions of u in English:

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U 2

Pronunciation: /yo͞o/
(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

Pronunciation: /yo͞o/

abbreviation

(also u) informal You: what will u do next?

symbol

The chemical element uranium.
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There are 5 main definitions of u in English:

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U 4

Pronunciation: /yo͞o/

adjective

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

Origin

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

Pronunciation: /o͞o/

noun

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