- The nominal of the second tone in the model major scale (that in C) or of the fourth tone in the relative minor scale of C (that in A minor) or of the key tone in the relative minor of F.
- The fourth letter of the English alphabet, and a vocal consonant. The English letter is from Latin, which is from Greek, which took it from Ph/nician, the probable ultimate origin being Egyptian. It is related most nearly to t and th; as, Eng. deep, G. tief; Eng. daughter, G. tochter, Gr. qyga`thr, Skr. duhitr. See Guide to Pronunciation,
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). d. Retrieved September 22, 2026, from http://smartdefine.org/d/definitions/1994192 |
| Chicago | Webster's. 2011. "d" http://smartdefine.org/d/definitions/1994192 (accessed September 22, 2026). |
| Harvard | Webster's 2011, d, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/d/definitions/1994192>. |
| MLA | Webster's. "d" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/d/definitions/1994192> |