I. ˈyü noun
( plural u's or us ˈyüz)
Usage: often capitalized, often attributive
Date: before 12th century
1.
a. : the 21st letter of the English alphabet
b. : a graphic representation of this letter
c. : a speech counterpart of orthographic u
2. : a graphic device for reproducing the letter u
3. : one designated u especially as the 21st in order or class
4.
[abbreviation for unsatisfactory ]
a. : a grade rating a student's work as unsatisfactory
b. : one graded or rated with a U
5. : something shaped like the letter U
II. abbreviation
1. unit
2. unsymmetrical
3. upper