| decade | (noun) the cardinal number that is the sum of nine and one; the base of the decimal system | Synonyms: 10, ten, tenner, X |
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| (noun) a period of 10 years | Synonyms: decennary, decennium |
| decadence | (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadency, degeneracy, degeneration |
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| decadency | (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, degeneracy, degeneration |
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| decadent | (noun) a person who has fallen into a decadent state (morally or artistically) | - |
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| decaf | (noun) coffee with the caffeine removed | Synonyms: decaffeinated coffee |
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| decagon | (noun) a polygon with 10 sides and 10 angles | - |
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| decagram | (noun) 10 grams | Synonyms: dag, dekagram, dkg |
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| decahedron | (noun) any polyhedron having ten plane faces | - |
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| decal | (noun) either a design that is fixed to some surface or a paper bearing the design which is to be transferred to the surface | Synonyms: decalcomania |
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| decalcification | (noun) loss of calcium from bones or teeth | - |
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| decalcomania | (noun) the art of transferring designs from specially prepared paper to a wood or glass or metal surface | - |
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| (noun) either a design that is fixed to some surface or a paper bearing the design which is to be transferred to the surface | Synonyms: decal |
| decalescence | (noun) phenomenon that occurs when a metal is being heated and there is a sudden slowing in the rate of temperature increase; slowing is caused by a change in the internal crystal structure of the metal | - |
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| decaliter | (noun) a metric unit of volume or capacity equal to 10 liters | Synonyms: dal, decalitre, dekaliter, dekalitre, dkl |
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| decalitre | (noun) a metric unit of volume or capacity equal to 10 liters | Synonyms: dal, decaliter, dekaliter, dekalitre, dkl |
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| decameter | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decametre, dekameter, dekametre, dkm |
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| decametre | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, dekameter, dekametre, dkm |
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| decampment | (noun) breaking camp | - |
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| (noun) the act of running away secretly (as to avoid arrest) | Synonyms: abscondment |
| decantation | (noun) the act of gently pouring off a clear liquor (as from its original bottle) without disturbing the lees | - |
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| decanter | (noun) a bottle with a stopper; for serving wine or water | Synonyms: carafe |
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| decapitation | (noun) killing by cutting off the head | Synonyms: beheading |
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| (noun) execution by cutting off the victim's head | Synonyms: beheading |
| decapod | (noun) crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax | Synonyms: decapod crustacean |
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| (noun) cephalopods having eight short tentacles plus two long ones | - |
| decarboxylase | (noun) any of the enzymes that hydrolize the carboxyl group | - |
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| decarboxylation | (noun) the process of removing a carboxyl group from a chemical compound (usually replacing it with hydrogen) | - |
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| decasyllable | (noun) a verse line having ten syllables | - |
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| decathlon | (noun) an athletic contest consisting of ten different events | - |
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| decay | (noun) the organic phenomenon of rotting | Synonyms: decomposition |
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| (noun) a gradual decrease; as of stored charge or current | Synonyms: decline |
| (noun) the process of gradually becoming inferior | - |
| (noun) the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation | Synonyms: disintegration, radioactive decay |
| (noun) an inferior state resulting from the process of decaying | - |