D

Universal Words noun, abbreviation, symbol noun (also d) [C,U] (plural D's, d's ) 1 the fourth letter of the English alphabet: 'Dog' begins with (a) D / 'D'. 2 (D) (music) the second note in the scale of C MAJOR 3 (D) the fourth highest mark/grade that a student can get for a piece of work, showing that it is not very good: He got (a) D / 'D' in / for Geography. seealsoD-DAY abbreviation (also D. especially in AmE) (in politics in the US) DEMOCRAT; DEMOCRATIC symbol the number 500 in ROMANNUMERALS