Copyright © HarperCollins Publishers. 2. In some languages and transcription systems, d may also represent other sounds, such as /t/ or /ð/. d, letter that has retained the fourth place in the alphabet from the earliest point at which it appears in history. contraction of do or did before you: How d'you like your eggs cooked? D'you go to the movies last night? For example, 'you had' can be shortened to 'you'd'. Also used in Latin to translate Aristotle's Greek grammatical term genos. 1. any spoken sound represented by this letter. For example, 'I would' can be shortened to 'I'd'. D, d (di) n.