Main definitions of b in US English:

: b1B2B3



  • 1Physics

  • 2"b."Born (used to indicate a date of birth)

    ‘George Lloyd (b. 1913)’
  • 3Billion.

  • 4Bass.

  • 5Basso.




Main definitions of b in US English:

: b1B2B3



  • 1(used in recording moves in chess) bishop.

  • 2Black (used in describing grades of pencil lead)

    ‘2HB pencils’
  • 3US (in personal ads) black.

  • 4Bomber (in designations of US aircraft types)

    ‘a B52’

Main definitions of b in US English:

: b1B2B3


(also b)

nounPlural B's, Plural Bs, Plural bs

  • 1The second letter of the alphabet.

    1. 1.1 The second highest class of academic mark.
    2. 1.2 Denoting the second-highest-earning socioeconomic category for marketing purposes, including intermediate management and professional personnel.
    3. 1.3"b"Chess Denoting the second file from the left, as viewed from White's side of the board.
    4. 1.4usually "b" The second constant to appear in an algebraic equation.
    5. 1.5Geology Denoting a soil horizon of intermediate depth, typically the subsoil.
    6. 1.6 The human blood type (in the ABO system) containing the B antigen and lacking the A.
  • 2usually "B"Music
    The seventh note of the diatonic scale of C major.

    1. 2.1 A key based on a scale with B as its keynote.

  • 1The chemical element boron.

  • 2Physics
    Magnetic flux density.


  • plan B

    • An alternative strategy.

      ‘it's time I put plan B into action’
      • ‘With bigger vessels unfortunately absent, the society turned to plan B, launching five smaller boats into the quay, including a 1943 vintage dinghy used by the Royal Navy.’
      • ‘And our job is to work with them and help them come up with a plan A, a plan B, to define goals and to attain those goals.’
      • ‘But really, if this writing thing doesn't work out, I realize that if I don't come up with a plan B I actually am going to work in an office for the rest of my life.’
      • ‘Calling a few used-car dealerships is probably still not a bad idea - it will take some of the pressure off the sale if I know I have a viable plan B for selling it.’
      • ‘What if I hadn't rushed into a semi-academic job and had pursued my plan B, which was to work as a library assistant and write in every spare moment of the day?’
      • ‘The iconoclastic inclinations of Ireland's youth are understandable, but there's no plan B.’
      • ‘Highly agitated by the display before her Felicia fled to the house and began to strategize her plan B for winning back her former husband.’
      • ‘So now you're falling back on plan B - demanding that I turn him over so you can bring him to Dominic.’
      • ‘Everyone realises that there is no plan B in the event of failure.’
      • ‘After months of reassuring everyone that there was no plan B if the French reject the constitution - guess what?’
      • ‘It's a good idea to have a plan B, so if the dotcom millionaire scheme doesn't come off you have something to fall back on.’
      • ‘I hope she has a plan B if vet school doesn't take her!’
      • ‘If not, they will revert to plan B which is using the same system as last year.’
      • ‘So I keep wondering: What is the Democrats' plan B?’
      • ‘All week, our game plan had been to throw it wide but I thought plan B worked well.’
      • ‘I'm afraid it's plan B - I've ordered the donuts - he likes those doesn't he?’
      • ‘It's called plan B, you know, when you make a pact with a friend to get married if neither one of you finds anyone by the time you're 40.’
      • ‘‘It is not surprising there was no plan B,’ he said, ‘because it is very difficult to work out what it would be.’’
      • ‘While Scotland's great outdoors can be very beautiful and romantic, we do want couples to have a plan B in case the weather turns nasty.’
      • ‘The human race is conducting a gigantic and unpredictable experiment with planet Earth with potentially horrendous consequences and no plan B in sight.’