D

(Ger. D; Fr. ré; It. ré). 1. The second TONE and DEGREE of the C major scale. 2. In music theory, uppercase D designates the D-major TRIAD, lowercase d the d-minor triad. 3. Da (D.C. = DA CAPO); Dal (D.S. = Dal segno, to the sign).

In French, Spanish, Italian, and Russian terminology, D is called Re, derived from the first syllable of the second line of the millennian hymn Ut queant Iaxis: "Resonare libris. "