[ C ] plural B’s, Bs, b’s or bs also b the second letter of the English alphabet

music [ C/U ] plural B’s or Bs in Western music, the seventh note in the scale (= series of notes) that begins on the note C, or a set of notes based on this note

[ C ] plural B’s or Bs a mark that means very good, given to something of satisfactory quality, esp. school work:

written abbreviation for billion :