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U
1
(U)
Pronunciation:
/juː/
(also
u
)
noun
(
plural
Us
or
U's
)
1
the twenty-first letter of the alphabet.
denoting 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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U
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U-bend
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