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, d (di) n., pl The fourth letter of the english alphabet, a consonant Any spoken sound represented by this letter.
In some languages and transcription systems, d may also represent other sounds, such as /t/ or /ð/. Used when giving the dates of someone's birth and death: For example, 'you had' can be shortened to 'you'd' It is added to the end of the pronoun which is the subject of the verb For example, 'i would' can be shortened to 'i'd' Collins cobuild advanced learner’s dictionary
Refers to the fourth letter of the alphabet (e.g., “the word ‘dog’ starts with the letter d”) The common basic symbols are i (=1), v (=5), x (=10), l (=50), c (=100), d (=500), and m (=1000) The roman numerals for one to nine are I, ii, iii, iv, v, vi, vii, viii, ix.
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