u noun
plural u's or U's /ˈjuːz/
plural u's or U's /ˈjuːz/
Learner's definition of U
1
: the 21st letter of the English alphabet英语字母表的第21个字母 [count]
[noncount]
2
[count] British : a grade given to a student whose work is judged as not satisfactory（英国学生的学业成绩）不满意