B BrE AmE , b /biː/ noun ( plural B’s , b’s )
1 . [uncountable and countable] the second letter of the English alphabet
2 . [uncountable and countable] the seventh note in the musical ↑ scale of C ↑ major or the musical ↑ key based on this note
3 . [countable] a mark given to a student’s work to show that it is good but not excellent:
I got a B in history.
4 . [uncountable] used to refer in a short way to one of two different things or people. You can call the first one A.:
the advantages and disadvantages of choosing product A or B
⇨ plan B at ↑ plan 1 (6)
5 . B4509/B1049 etc the name of a road in Britain that is smaller than an ↑ A-road
6 . [uncountable] a common type of blood
⇨ from A to B at ↑ A 1 (6), ⇨ ↑ B-movie , ↑ B-side , ↑ B-road