| 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 |
| deceitful | (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: ambidextrous, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
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| (adjective) involving deception | Synonyms: fallacious, fraudulent |
| deceitfully | (adverb) in a corrupt and deceitful manner | Synonyms: dishonestly, venally |
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| deceitfulness | (noun) the quality of being deceitful | - |
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| deceive | (verb) cause someone to believe an untruth | Synonyms: betray, lead astray |
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| (verb) be false to; be dishonest with | Synonyms: cozen, delude, lead on |
| deceiver | (noun) someone who leads you to believe something that is not true | Synonyms: beguiler, cheat, cheater, slicker, trickster |
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| deceivingly | (adverb) in a misleading way | Synonyms: deceptively, misleadingly |
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| decelerate | (verb) lose velocity; move more slowly | Synonyms: retard, slow, slow down, slow up |
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| (verb) reduce the speed of | Synonyms: slow down |
| 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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| decent | (adjective) conforming to conventions of sexual behavior | - |
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| (adjective) meeting requirements | Synonyms: acceptable, satisfactory |
| (adjective) observing conventional sexual mores in speech or behavior or dress | - |
| (adjective) in harmony with the spirit of particular persons or occasion | Synonyms: fitting |
| (adjective) socially or conventionally correct; refined or virtuous | Synonyms: nice |
| (adjective) sufficiently clothed to see visitors or appear in public | - |
| (adverb) in the right manner; correctly; suitably | Synonyms: decently, properly, right |
| 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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| decently | (adverb) in a decent manner | - |
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| (adverb) in the right manner; correctly; suitably | Synonyms: decent, properly, right |
| decentralisation | (noun) the spread of power away from the center to local branches or governments | Synonyms: decentralization |
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| decentralise | (verb) make less central | Synonyms: decentralize, deconcentrate |
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| decentralised | (adjective) withdrawn from a center or place of concentration; especially having power or function dispersed from a central to local authorities | Synonyms: decentralized |
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| decentralising | (adjective) tending away from a central point | Synonyms: decentralizing |
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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 |
| decentralize | (verb) make less central | Synonyms: decentralise, deconcentrate |
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| decentralized | (adjective) withdrawn from a center or place of concentration; especially having power or function dispersed from a central to local authorities | Synonyms: decentralised |
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| decentralizing | (adjective) tending away from a central point | Synonyms: decentralising |
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| 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 |
| deceptive | (adjective) designed to deceive or mislead either deliberately or inadvertently | Synonyms: misleading |
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| (adjective) causing one to believe what is not true or fail to believe what is true | Synonyms: delusory |
| deceptively | (adverb) in a misleading way | Synonyms: deceivingly, misleadingly |
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| deceptiveness | (noun) the quality of being deceptive | Synonyms: obliquity |
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| decerebrate | (verb) remove the cerebrum from (a human body) | - |
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| decertify | (verb) cause to be no longer approved or accepted | Synonyms: derecognise, derecognize |
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| dechlorinate | (verb) remove chlorine from (water) | - |
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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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| decide | (verb) reach, make, or come to a decision about something | Synonyms: determine, make up one's mind |
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| (verb) bring to an end; settle conclusively | Synonyms: adjudicate, resolve, settle |
| (verb) cause to decide | - |
| (verb) influence or determine | - |
| decideable | (adjective) capable of being decided as following or not following from the axioms of a logical system | - |
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| decided | (adjective) recognizable; marked | Synonyms: distinct |
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| decidedly | (adverb) without question and beyond doubt | Synonyms: by all odds, definitely, emphatically, in spades, unquestionably |
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| deciding | (adjective) having the power or quality of deciding | Synonyms: determinant, determinative, determining |
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| (noun) the cognitive process of reaching a decision | Synonyms: decision making |
| decidua | (noun) the epithelial tissue of the endometrium | - |
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| deciduous | (adjective) (of plants and shrubs) shedding foliage at the end of the growing season | - |
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| (adjective) (of teeth, antlers, etc.) being shed at the end of a period of growth | - |
| 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 | (adjective) numbered or proceeding by tens; based on ten | Synonyms: denary |
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| (noun) a proper fraction whose denominator is a power of 10 | Synonyms: decimal fraction |
| (noun) a number in the decimal system | - |
| decimalisation | (noun) the act of changing to a decimal system | Synonyms: decimalization |
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| decimalise | (verb) change to the decimal system | Synonyms: decimalize |
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| (verb) change from fractions to decimals | Synonyms: decimalize |
| decimalization | (noun) the act of changing to a decimal system | Synonyms: decimalisation |
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| decimalize | (verb) change to the decimal system | Synonyms: decimalise |
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| (verb) change from fractions to decimals | Synonyms: decimalise |
| decimate | (verb) kill in large numbers | Synonyms: annihilate, carry off, eliminate, eradicate, extinguish, wipe out |
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| (verb) kill one in every ten, as of mutineers in Roman armies | - |
| 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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| decipher | (verb) read with difficulty | Synonyms: trace |
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| (verb) convert code into ordinary language | Synonyms: decode, decrypt |
| decipherable | (adjective) easily deciphered | Synonyms: clear, readable |
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| decipherably | (adverb) in a legible manner | Synonyms: legibly, readably |
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| deciphered | (adjective) converted from cryptic to intelligible language | - |
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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 | - |
| decisive | (adjective) determining or having the power to determine an outcome | - |
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| (adjective) characterized by decision and firmness | - |
| (adjective) forming or having the nature of a turning point or crisis | Synonyms: critical |
| (adjective) unmistakable | - |
| decisively | (adverb) with finality; conclusively | - |
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| (adverb) with firmness of purpose | Synonyms: resolutely |
| (adverb) in an indisputable degree | - |
| 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 |
| (verb) knock down with force | Synonyms: coldcock, dump, floor, knock down |
| (verb) decorate | Synonyms: bedeck, bedight |
| (verb) be beautiful to look at | Synonyms: adorn, beautify, decorate, embellish, grace |
| 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 |
| deckled | (adjective) having a rough edge; used of handmade paper or paper resembling handmade | Synonyms: deckle-edged, featheredged |
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| declaim | (verb) recite in elocution | Synonyms: recite |
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| (verb) speak against in an impassioned manner | Synonyms: inveigh |
| 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 | - |
| declamatory | (adjective) ostentatiously lofty in style | Synonyms: bombastic, large, orotund, tumid, turgid |
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| declarable | (adjective) that must be declared | - |
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| 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 | (adjective) relating to the use of or having the nature of a declaration | Synonyms: asserting, declaratory |
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| (adjective) relating to the mood of verbs that is used simple in declarative statements | Synonyms: indicative |
| (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 |
| declaratory | (adjective) relating to the use of or having the nature of a declaration | Synonyms: asserting, declarative |
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| declare | (verb) state emphatically and authoritatively | - |
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| (verb) state firmly | - |
| (verb) make a declaration (of dutiable goods) to a customs official | - |
| (verb) declare to be | Synonyms: adjudge, hold |
| (verb) announce publicly or officially | Synonyms: announce |
| (verb) proclaim one's support, sympathy, or opinion for or against | - |
| (verb) designate (a trump suit or no-trump) with the final bid of a hand | - |
| (verb) authorize payments of | - |
| declared | (adjective) made known or openly avowed | - |
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| (adjective) declared as fact; explicitly stated | Synonyms: stated |
| 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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| declassified | (adjective) having had security classification removed | - |
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| declassify | (verb) lift the restriction on and make available again | - |
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| declaw | (verb) remove the claws from | - |
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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 |
| (verb) grow smaller | Synonyms: go down, wane |
| (verb) grow worse | Synonyms: worsen |
| (verb) show unwillingness towards | Synonyms: refuse |
| (verb) inflect for number, gender, case, etc. | - |
| (verb) go down | - |
| (verb) fall in value | Synonyms: correct, slump |
| (verb) not accept as true | Synonyms: pass up, refuse, reject, turn down |
| declinometer | (noun) an instrument for measuring magnetic declination | Synonyms: transit declinometer |
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| declivitous | (adjective) sloping down rather steeply | Synonyms: downhill, downward-sloping |
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| declivity | (noun) a downward slope or bend | Synonyms: declension, declination, decline, descent, downslope, fall |
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| declutch | (verb) disengage the clutch of a car | - |
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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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| decoct | (verb) extract the essence of something by boiling it | - |
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| (verb) steep in hot water | - |
| (verb) be cooked until very little liquid is left | Synonyms: boil down, concentrate, reduce |
| decoction | (noun) (pharmacology) the extraction of water-soluble drug substances by boiling | - |
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| decode | (verb) convert code into ordinary language | Synonyms: decipher, decrypt |
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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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| decoke | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarbonize, decarburise, decarburize |
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| decollate | (verb) cut the head of | Synonyms: behead, decapitate |
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