| dec | (noun) (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere | Synonyms: celestial latitude, declination |
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| 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 | - |
| decease | (noun) the event of dying or departure from life | Synonyms: death, expiry |
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| deceased | (noun) someone who is no longer alive | Synonyms: dead person, dead soul, deceased person, decedent, departed |
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| decedent | (noun) someone who is no longer alive | Synonyms: dead person, dead soul, deceased, deceased person, departed |
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| deceit | (noun) the act of deceiving | Synonyms: deception, dissembling, dissimulation |
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| (noun) the quality of being fraudulent | Synonyms: fraudulence |
| (noun) a misleading falsehood | Synonyms: deception, misrepresentation |
| deceitfulness | (noun) the quality of being deceitful | - |
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| deceiver | (noun) someone who leads you to believe something that is not true | Synonyms: beguiler, cheat, cheater, slicker, trickster |
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| deceleration | (noun) the act of decelerating; decreasing the speed | - |
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| (noun) a decrease in rate of change | Synonyms: retardation, slowing |
| (noun) (physics) a rate of decrease in velocity | - |
| decency | (noun) the quality of conforming to standards of propriety and morality | - |
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| (noun) the quality of being polite and respectable | - |
| decennary | (noun) a period of 10 years | Synonyms: decade, decennium |
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| decennium | (noun) a period of 10 years | Synonyms: decade, decennary |
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| decentalisation | (noun) the social process in which population and industry moves from urban centers to outlying districts | Synonyms: decentralization |
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| decentering | (noun) Jean Piaget's theory of cognitive development where a child slowly moves away from an egocentric world to a world shared with others. | Synonyms: decentration |
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| decentralisation | (noun) the spread of power away from the center to local branches or governments | Synonyms: decentralization |
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| decentralization | (noun) the spread of power away from the center to local branches or governments | Synonyms: decentralisation |
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| (noun) the social process in which population and industry moves from urban centers to outlying districts | Synonyms: decentalisation |
| decentration | (noun) Jean Piaget's theory of cognitive development where a child slowly moves away from an egocentric world to a world shared with others. | Synonyms: decentering |
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| deception | (noun) the act of deceiving | Synonyms: deceit, dissembling, dissimulation |
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| (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, illusion, legerdemain, magic, magic trick, thaumaturgy, trick |
| (noun) a misleading falsehood | Synonyms: deceit, misrepresentation |
| deceptiveness | (noun) the quality of being deceptive | Synonyms: obliquity |
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| deciban | (noun) a unit of information, one tenth of a ban. | - |
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| decibel | (noun) a logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity | Synonyms: dB |
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| deciding | (noun) the cognitive process of reaching a decision | Synonyms: decision making |
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| decidua | (noun) the epithelial tissue of the endometrium | - |
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| decigram | (noun) 1/10 gram | Synonyms: dg |
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| decile | (noun) (statistics) any of nine points that divided a distribution of ranked scores into equal intervals where each interval contains one-tenth of the scores | - |
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| deciliter | (noun) a metric unit of volume equal to one tenth of a liter | Synonyms: decilitre, dl |
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| decilitre | (noun) a metric unit of volume equal to one tenth of a liter | Synonyms: deciliter, dl |
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| decimal | (noun) a proper fraction whose denominator is a power of 10 | Synonyms: decimal fraction |
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| (noun) a number in the decimal system | - |
| decimalisation | (noun) the act of changing to a decimal system | Synonyms: decimalization |
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| decimalization | (noun) the act of changing to a decimal system | Synonyms: decimalisation |
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| decimation | (noun) destroying or killing a large part of the population | - |
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| decimeter | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimetre, dm |
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| decimetre | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimeter, dm |
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| decipherer | (noun) a reader capable of reading and interpreting illegible or obscure text | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decoder |
| decipherment | (noun) the activity of making clear or converting from code into plain text | Synonyms: decoding, decryption |
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| decision | (noun) the act of making up your mind about something | Synonyms: conclusion, determination |
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| (noun) the trait of resoluteness as evidenced by firmness of character or purpose | Synonyms: decisiveness |
| (noun) a position or opinion or judgment reached after consideration | Synonyms: conclusion, determination |
| (noun) the outcome of a game or contest | - |
| (noun) (boxing) a victory won on points when no knockout has occurred | - |
| decisiveness | (noun) the trait of resoluteness as evidenced by firmness of character or purpose | Synonyms: decision |
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| (noun) the quality of being final or definitely settled | Synonyms: conclusiveness, finality |
| deck | (noun) any of various platforms built into a vessel | - |
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| (noun) street name for a packet of illegal drugs | - |
| (noun) a porch that resembles the deck on a ship | - |
| (noun) a pack of 52 playing cards | Synonyms: deck of cards, pack of cards |
| decker | (noun) (often used in combinations) something constructed with multiple levels | - |
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| deckhand | (noun) a member of a ship's crew who performs manual labor | Synonyms: roustabout |
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| deckle | (noun) (paper making) a frame used to form paper pulp into sheets | - |
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| (noun) rough edge left by a deckle on handmade paper or produced artificially on machine-made paper | Synonyms: deckle edge |
| declamation | (noun) vehement oratory | - |
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| (noun) recitation of a speech from memory with studied gestures and intonation as an exercise in elocution or rhetoric | - |
| declaration | (noun) a statement that is emphatic and explicit (spoken or written) | - |
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| (noun) a formal expression by a meeting; agreed to by a vote | Synonyms: resolution, resolve |
| (noun) (law) unsworn statement that can be admitted in evidence in a legal transaction | - |
| (noun) a formal public statement | Synonyms: announcement, annunciation, proclamation |
| (noun) (contract bridge) the highest bid becomes the contract setting the number of tricks that the bidder must make | Synonyms: contract |
| (noun) a statement of taxable goods or of dutiable properties | - |
| declarative | (noun) a mood (grammatically unmarked) that represents the act or state as an objective fact | Synonyms: common mood, declarative mood, fact mood, indicative, indicative mood |
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| declarer | (noun) the bridge player in contract bridge who wins the bidding and can declare which suit is to be trumps | Synonyms: contractor |
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| (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, asseverator, avower |
| declassification | (noun) reduction or removal by the government of restrictions on a classified document or weapon | - |
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| declension | (noun) a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms | - |
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| (noun) a downward slope or bend | Synonyms: declination, decline, declivity, descent, downslope, fall |
| (noun) process of changing to an inferior state | Synonyms: decline in quality, deterioration, worsening |
| (noun) the inflection of nouns and pronouns and adjectives in Indo-European languages | - |
| declination | (noun) a polite refusal of an invitation | Synonyms: regrets |
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| (noun) (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere | Synonyms: celestial latitude, dec |
| (noun) a downward slope or bend | Synonyms: declension, decline, declivity, descent, downslope, fall |
| (noun) a condition inferior to an earlier condition; a gradual falling off from a better state; decline | Synonyms: decline |
| decline | (noun) a downward slope or bend | Synonyms: declension, declination, declivity, descent, downslope, fall |
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| (noun) a gradual decrease; as of stored charge or current | Synonyms: decay |
| (noun) change toward something smaller or lower | Synonyms: diminution |
| (noun) a condition inferior to an earlier condition; a gradual falling off from a better state; decline | Synonyms: declination |
| declinometer | (noun) an instrument for measuring magnetic declination | Synonyms: transit declinometer |
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| declivity | (noun) a downward slope or bend | Synonyms: declension, declination, decline, descent, downslope, fall |
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| deco | (noun) a style of design that was popular in the 1920s and 1930s; marked by stylized forms and geometric designs adapted to mass production | Synonyms: art deco |
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| decoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant, anticoagulant medication |
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| decoction | (noun) (pharmacology) the extraction of water-soluble drug substances by boiling | - |
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| decoder | (noun) a machine that converts a coded text into ordinary language | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decipherer |
| decoding | (noun) the activity of making clear or converting from code into plain text | Synonyms: decipherment, decryption |
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| decolletage | (noun) a low-cut neckline on a woman's dress | - |
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| decolonisation | (noun) the action of changing from colonial to independent status | Synonyms: decolonization |
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| decolonization | (noun) the action of changing from colonial to independent status | Synonyms: decolonisation |
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| decomposition | (noun) the analysis of a vector field | Synonyms: vector decomposition |
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| (noun) the organic phenomenon of rotting | Synonyms: decay |
| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, putrefaction, rot, rotting |
| (noun) (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance | Synonyms: breakdown, chemical decomposition reaction, decomposition reaction |
| (noun) in a decomposed state | Synonyms: disintegration |
| decompressing | (noun) relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure) | Synonyms: decompression |
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| decompression | (noun) relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure) | Synonyms: decompressing |
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| (noun) restoring compressed information to its normal form for use or display | - |
| decongestant | (noun) a drug that decreases pulmonary congestion | - |
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| deconstruction | (noun) a philosophical theory of criticism (usually of literature or film) that seeks to expose deep-seated contradictions in a work by delving below its surface meaning | Synonyms: deconstructionism |
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| deconstructionism | (noun) a philosophical theory of criticism (usually of literature or film) that seeks to expose deep-seated contradictions in a work by delving below its surface meaning | Synonyms: deconstruction |
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| deconstructivism | (noun) a school of architecture based on the philosophical theory of deconstruction | - |
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| decontamination | (noun) the removal of contaminants | - |
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| decor | (noun) decoration consisting of the layout and furnishings of a livable interior | Synonyms: interior decoration |
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| decoration | (noun) the act of decorating something (in the hope of making it more attractive) | - |
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| (noun) something used to beautify | Synonyms: ornament, ornamentation |
| (noun) an award for winning a championship or commemorating some other event | Synonyms: laurel wreath, medal, medallion, palm, ribbon |
| decorativeness | (noun) an appearance that serves to decorate and make something more attractive | - |
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| decorator | (noun) someone who decorates | Synonyms: ornamentalist |
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| (noun) a person who specializes in interior decoration | Synonyms: house decorator, interior decorator, room decorator |
| decorousness | (noun) propriety in manners and conduct | Synonyms: decorum |
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| decortication | (noun) removal of the outer covering of an organ or part | - |
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| decorum | (noun) propriety in manners and conduct | Synonyms: decorousness |
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| decoupage | (noun) the art of decorating a surface with shapes or pictures and then coating it with varnish or lacquer | - |
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| (noun) art produced by decorating a surface with cutouts and then coating it with several layers of varnish or lacquer | - |