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D

noun
     
D , d plural D's, d's
1 [uncountable and countable]SLA the fourth letter of the English alphabet
2 [uncountable and countable]APM the second note in the musical scale of C major or the musical key based on this note
3 [countable]SE a mark given to a student's work to show that it is not very good:
I got a D in history last semester.
4HMN the number 500 in the system of roman numerals

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