U

noun

1 (C) a letter used in Britain to officially show that a film is suitable for people of any age

2 (C) a mark used in schools and examinations to show that your work or behaviour is extremely bad

3 (C) BrE a grade 1 (5) given in an examination to show that the work is too bad to be marked at all

4 (singular) AmE old-fashioned an abbreviation for university: Indiana U