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d, letter that has retained the fourth place in the alphabet from the earliest point at which it appears in history. It corresponds to Semitic daleth and Greek delta (Δ). The form is thought to derive from an early pictograph, possibly Egyptian, indicating the folding door of a tent.
D is the fourth (number 4) letter in the alphabet. It comes from the Greek Delta and the Phoenician Dalet. Meanings for D. In education, D is a failing grade; In electronics, D is a standard size dry cell battery. In music, D is a note sometimes named “Re”. In Roman numerals, D also means the number 500.
1. the fourth in order or in a series. 2. ( sometimes l.c.) (in some grading systems) a grade or mark indicating poor or barely acceptable quality. 3. a. the second note of the ascending C major scale. b. a tonality having D as the tonic. 4. ( sometimes l.c.) the Roman numeral for 500. Compare Roman numerals.
