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D

fourth letter of the Roman alphabet, from Greek delta, from Phoenician and Hebrew daleth, pausal form of deleth "door," so called from its shape. The form of the modern letter is the Greek delta (Δ) with one angle rounded. As the sign for "500" in Roman numerals, it is said to be half of CIƆ, which was an early form of M, the sign for "1,000." 3-D for "three-dimensional" is attested from 1952.

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Definitions of D from WordNet
1
d (n.)
a fat-soluble vitamin that prevents rickets;
Synonyms: vitamin D / calciferol / viosterol / ergocalciferol / cholecalciferol
d (n.)
the cardinal number that is the product of one hundred and five;
Synonyms: five hundred / "
d (n.)
a movie with images having three dimensional form or appearance;
Synonyms: three-D / -D
d (n.)
having a three-dimensional form or appearance;
Synonyms: three-D / -D
2
d (adj.)
denoting a quantity consisting of 500 items or units;
Synonyms: five hundred / "
d (adj.)
coming next after the first in position in space or time or degree or magnitude;
Synonyms: second / nd
From wordnet.princeton.edu