Meaning of D in English

D

/ diː; NAmE / noun , abbreviation , symbol

■ noun (also d ) [ C , U ] ( pl. Ds , D's , d's / diːz; NAmE /)

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.

—see also D-Day

■ abbreviation

(also D. especially in NAmE ) ( in politics in the US ) Democrat ; Democratic

■ symbol

the number 500 in Roman numerals

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.