U is the 21st letter of the alphabet.(noun)
An example of u is the second letter in the word "cut."
The definition of u refers to the upper class in Britain.(adjective)
An example of people belonging to the u class are kings and queens.
See u in Webster's New World College Dictionary
Origin: U(nion of Orthodox Hebrew Congregations)
See u in American Heritage Dictionary 4
or Unoun pl. U's u's or U's also us or Us
Origin: u(pper class).
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