denoting the second in a set of items, categories, sizes, etc..
the second highest class of academic mark:my grade on that first paper was a B
(in the UK) denoting a secondary road:the B4248B-roads
denoting the second-highest-earning socio-economic category for marketing purposes, including intermediate management and professional personnel.
(b) Chess denoting the second file from the left, as viewed from White’s side of the board.
(usually b) the second fixed constant to appear in an algebraic equation.
Geology denoting a soil horizon of intermediate depth, typically the subsoil.
the human blood type (in the ABO system) containing the B antigen and lacking the A.
(with numeral) denoting a series of international standard paper sizes each twice the area of the next, as B0, B1, B2, B3, B4, etc., B4 being 250 × 353 mm.
2 (usually B) Music the seventh note of the diatonic scale of C major.
a key based on a scale with B as its keynote.
Phrases
plan B
an alternative strategy:it’s time I put plan B into action