| 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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| decolletage | (noun) a low-cut neckline on a woman's dress | - |
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| decollete | (adjective) (of a garment) having a low-cut neckline | Synonyms: low-cut, low-necked |
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| decolonisation | (noun) the action of changing from colonial to independent status | Synonyms: decolonization |
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| decolonise | (verb) grant independence to (a former colony) | Synonyms: decolonize |
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| decolonization | (noun) the action of changing from colonial to independent status | Synonyms: decolonisation |
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| decolonize | (verb) grant independence to (a former colony) | Synonyms: decolonise |
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| decolor | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolorise, decolorize, decolour, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolorise | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorize, decolour, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolorize | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolour, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolour | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolorize, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolourise | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolorize, decolour, decolourize, discolorise, discolorize, discolourise |
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| decolourize | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolorize, decolour, decolourise, discolorise, discolorize, discolourise |
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| decommission | (verb) withdraw from active service | - |
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| decomposable | (adjective) capable of being partitioned | Synonyms: analyzable |
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| decompose | (verb) separate (substances) into constituent elements or parts | Synonyms: break down, break up |
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| (verb) break down | Synonyms: molder, moulder, rot |
| (verb) lose a stored charge, magnetic flux, or current | Synonyms: decay, disintegrate |
| 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 |
| decompositional | (adjective) causing organic decay | - |
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| decompound | (adjective) of a compound leaf; consisting of divisions that are themselves compound | - |
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| decompress | (verb) become less tense, rest, or take one's ease | Synonyms: loosen up, relax, slow down, unbend, unwind |
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| (verb) decrease the pressure of | Synonyms: depressurise, depressurize |
| (verb) restore to its uncompressed form | Synonyms: uncompress |
| 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 | - |
| deconcentrate | (verb) make less central | Synonyms: decentralise, decentralize |
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| decongestant | (noun) a drug that decreases pulmonary congestion | - |
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| deconsecrate | (verb) remove the consecration from a person or an object | Synonyms: desecrate, unhallow |
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| deconsecrated | (adjective) divested of consecration | - |
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| deconstruct | (verb) interpret (a text or an artwork) by the method of deconstructing | - |
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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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| deconstructionist | (adjective) of or concerned with the philosophical theory of literature known as deconstructionism | - |
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| deconstructivism | (noun) a school of architecture based on the philosophical theory of deconstruction | - |
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| decontaminate | (verb) rid of contamination | - |
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| decontamination | (noun) the removal of contaminants | - |
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| decontrol | (verb) relax or remove controls of | - |
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| decor | (noun) decoration consisting of the layout and furnishings of a livable interior | Synonyms: interior decoration |
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| decorate | (verb) provide with decoration | Synonyms: dress |
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| (verb) make more attractive by adding ornament, colour, etc. | Synonyms: adorn, beautify, embellish, grace, ornament |
| (verb) award a mark of honor, such as a medal, to | - |
| (verb) be beautiful to look at | Synonyms: adorn, beautify, deck, embellish, grace |
| decorated | (adjective) provided with something intended to increase its beauty or distinction | Synonyms: adorned |
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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 |
| decorative | (adjective) serving an esthetic rather than a useful purpose | Synonyms: cosmetic, ornamental |
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| decoratively | (adverb) in a decorative manner | - |
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| 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 |
| decorous | (adjective) characterized by propriety and dignity and good taste in manners and conduct | - |
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| (adjective) according with custom or propriety | Synonyms: becoming, comely, comme il faut, seemly |
| decorously | (adverb) in a proper and decorous manner | - |
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| decorousness | (noun) propriety in manners and conduct | Synonyms: decorum |
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| decorticate | (verb) remove the cortex of (an organ) | - |
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| (verb) remove the outer layer of | - |
| 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 | - |
| decouple | (verb) reduce or eliminate the coupling of (one circuit or part to another) | - |
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| (verb) eliminate airborne shock waves from (an explosive) | - |
| (verb) regard as unconnected | Synonyms: dissociate |
| (verb) disconnect or separate | Synonyms: uncouple |
| decoy | (noun) something used to lure fish or other animals into danger so they can be trapped or killed | Synonyms: bait, lure |
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| (noun) a beguiler who leads someone into danger (usually as part of a plot) | Synonyms: steerer |
| (verb) lure or entrap with or as if with a decoy | - |
| decrease | (noun) the act of decreasing or reducing something | Synonyms: diminution, reduction, step-down |
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| (noun) the amount by which something decreases | Synonyms: decrement |
| (noun) a change downward | Synonyms: drop-off, lessening |
| (noun) a process of becoming smaller or shorter | Synonyms: decrement |
| (verb) decrease in size, extent, or range | Synonyms: diminish, fall, lessen |
| (verb) make become smaller | Synonyms: lessen, minify |
| decreased | (adjective) made less in size or amount or degree | Synonyms: reduced |
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| decreasing | (adjective) becoming less or smaller | - |
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| (adjective) (music) decreasing in tempo and/or volume | - |
| decree | (noun) a legally binding command or decision entered on the court record (as if issued by a court or judge) | Synonyms: edict, fiat, order, rescript |
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| (verb) decide with authority | Synonyms: rule |
| (verb) issue a decree | - |
| decreed | (adjective) fixed or established especially by order or command | Synonyms: appointed, ordained, prescribed |
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| decrement | (noun) the amount by which something decreases | Synonyms: decrease |
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| (noun) a process of becoming smaller or shorter | Synonyms: decrease |
| decrementation | (noun) the operation of subtracting one from the operand. | - |
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| decrepit | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, feeble, infirm, rickety, sapless, weak, weakly |
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| (adjective) worn and broken down by hard use | Synonyms: creaky, derelict, flea-bitten, run-down, woebegone |