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| NOUN |
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| /diː/ |
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| 1 | the fourth letter of the English alphabet . D is a consonant . 英语字母表的第4个字母（为辅音字母） |
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| 2 | D the second note in the musical scale of C major 大调音阶中的第2个音符 |
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| 3 | D a mark that a teacher gives to a student’ s work to show that it is below average （学业成绩）差,丁级,D级 |
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| 4 | D the roman numeral for 500 （罗马数字的）500 |
| See also | | - d and c | | - d-day | |
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