| defection | (noun) withdrawing support or help despite allegiance or responsibility | Synonyms: abandonment, desertion |
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| (noun) the state of having rejected your religious beliefs for your political party or a cause (often in favor of opposing beliefs or causes) | Synonyms: apostasy, renunciation |
| defectiveness | (noun) the state of being defective | Synonyms: faultiness |
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| defector | (noun) a person who abandons their duty (as on a military post) | Synonyms: deserter |
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| defence | (noun) (military) military action or resources protecting a country against potential enemies | Synonyms: defense, defensive measure |
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| (noun) the act of defending someone or something against attack or injury | Synonyms: defense |
| (noun) a defendant's answer or plea denying the truth of the charges against him | Synonyms: defense, demurrer, denial |
| (noun) protection from harm | Synonyms: defense |
| (noun) a structure used to defend against attack | Synonyms: defense, defensive structure |
| (noun) the justification for some act or belief | Synonyms: defense, vindication |
| (noun) the speech act of answering an attack on your assertions | Synonyms: defense, refutation |
| (noun) the defendant and his legal advisors collectively | Synonyms: defense, defense lawyers, defense team |
| (noun) (sports) the team that is trying to prevent the other team from scoring | Synonyms: defending team, defense |
| (noun) an organization of defenders that provides resistance against attack | Synonyms: defence force, defense, defense force |
| (noun) (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires | Synonyms: defence mechanism, defence reaction, defense, defense mechanism, defense reaction |
| defencelessness | (noun) the property of being helpless in the face of attack | Synonyms: defenselessness, unprotectedness |
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| defendant | (noun) a person or institution against whom an action is brought in a court of law; the person being sued or accused | Synonyms: suspect |
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| defender | (noun) a person who cares for persons or property | Synonyms: guardian, protector, shielder |
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| (noun) a fighter who holds out against attack | Synonyms: withstander |
| defenestration | (noun) the act of throwing someone or something out of a window | - |
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| defense | (noun) (military) military action or resources protecting a country against potential enemies | Synonyms: defence, defensive measure |
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| (noun) the act of defending someone or something against attack or injury | Synonyms: defence |
| (noun) a defendant's answer or plea denying the truth of the charges against him | Synonyms: defence, demurrer, denial |
| (noun) protection from harm | Synonyms: defence |
| (noun) a structure used to defend against attack | Synonyms: defence, defensive structure |
| (noun) the justification for some act or belief | Synonyms: defence, vindication |
| (noun) the speech act of answering an attack on your assertions | Synonyms: defence, refutation |
| (noun) the defendant and his legal advisors collectively | Synonyms: defence, defense lawyers, defense team |
| (noun) (sports) the team that is trying to prevent the other team from scoring | Synonyms: defence, defending team |
| (noun) an organization of defenders that provides resistance against attack | Synonyms: defence, defence force, defense force |
| (noun) (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires | Synonyms: defence, defence mechanism, defence reaction, defense mechanism, defense reaction |
| defenselessness | (noun) the property of being helpless in the face of attack | Synonyms: defencelessness, unprotectedness |
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| defensibility | (noun) capability of being defended | - |
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| defensive | (noun) an attitude of defensiveness | Synonyms: defensive attitude |
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| defensiveness | (noun) excessive sensitivity to criticism | - |
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| deference | (noun) a courteous expression (by word or deed) of esteem or regard | Synonyms: respect |
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| (noun) a disposition or tendency to yield to the will of others | Synonyms: complaisance, compliance, compliancy, obligingness |
| (noun) courteous regard for people's feelings | Synonyms: respect, respectfulness |
| deferment | (noun) act of putting off to a future time | Synonyms: deferral, postponement |
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| deferral | (noun) act of putting off to a future time | Synonyms: deferment, postponement |
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| (noun) a state of abeyance or suspended business | Synonyms: recess |
| defervescence | (noun) abatement of a fever as indicated by a reduction in body temperature | - |
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| defiance | (noun) a defiant act | - |
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| (noun) intentionally contemptuous behavior or attitude | Synonyms: rebelliousness |
| (noun) a hostile challenge | - |
| defibrillation | (noun) treatment by stopping fibrillation of heart muscles (usually by electric shock delivered by a defibrillator) | - |
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| defibrillator | (noun) an electronic device that administers an electric shock of preset voltage to the heart through the chest wall in an attempt to restore the normal rhythm of the heart during ventricular fibrillation | - |
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| deficiency | (noun) lack of an adequate quantity or number | Synonyms: inadequacy, insufficiency |
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| (noun) the state of needing something that is absent or unavailable | Synonyms: lack, want |
| deficit | (noun) the property of being an amount by which something is less than expected or required | Synonyms: shortage, shortfall |
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| (noun) an excess of liabilities over assets (usually over a certain period) | - |
| (noun) (sports) the score by which a team or individual is losing | - |
| (noun) a deficiency or failure in neurological or mental functioning | - |
| defilade | (noun) the arrangement of defensive fortifications to protect against enemy fire | - |
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| defile | (noun) a narrow pass (especially one between mountains) | Synonyms: gorge |
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| defilement | (noun) the state of being polluted | Synonyms: befoulment, pollution |
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| defiler | (noun) a person or organization that causes pollution of the environment | Synonyms: polluter |
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| definability | (noun) the quality or state of being capable of being defined, limited, or explained. | - |
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| defining | (noun) any process serving to define the shape of something | Synonyms: shaping |
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| definiteness | (noun) the quality of being predictable with great confidence | Synonyms: determinateness |
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| definition | (noun) clarity of outline | - |
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| (noun) a concise explanation of the meaning of a word or phrase or symbol | - |
| definitors | (noun) council in a religious order who provide counsel and assistance to the superiors general and provincial superior of their order. | - |
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| deflagration | (noun) combustion that propagates through a gas or along the surface of an explosive at a rapid rate driven by the transfer of heat | - |
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| deflation | (noun) the act of letting the air out of something | - |
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| (noun) a contraction of economic activity resulting in a decline of prices | - |
| (noun) (geology) the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind | - |
| deflator | (noun) a statistical factor designed to remove the effect of inflation; inflation adjusted variables are in constant dollars | - |
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| deflection | (noun) a turning aside (of your course or attention or concern) | Synonyms: deflexion, deviation, digression, divagation, diversion |
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| (noun) the property of being bent or deflected | Synonyms: bending, deflexion |
| (noun) the amount by which a propagating wave is bent | Synonyms: deflexion, refraction |
| (noun) the movement of the pointer or pen of a measuring instrument from its zero position | Synonyms: deflexion |
| (noun) a twist or aberration; especially a perverse or abnormal way of judging or acting | Synonyms: warp |
| deflector | (noun) a device intended to turn aside the flow of something (water or air or smoke etc) | - |
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| deflexion | (noun) a turning aside (of your course or attention or concern) | Synonyms: deflection, deviation, digression, divagation, diversion |
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| (noun) the property of being bent or deflected | Synonyms: bending, deflection |
| (noun) the amount by which a propagating wave is bent | Synonyms: deflection, refraction |
| (noun) the movement of the pointer or pen of a measuring instrument from its zero position | Synonyms: deflection |
| defloration | (noun) the act of depriving a woman of her virginity (especially by rupturing the hymen through sexual intercourse) | - |
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| (noun) an act that despoils the innocence or beauty of something | - |
| defoliant | (noun) a chemical that is sprayed on plants and causes their leaves to fall off | - |
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| defoliation | (noun) causing the leaves of trees and other plants to fall off (as by the use of chemicals) | - |
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| (noun) the loss of foliage | - |
| defoliator | (noun) an insect that strips the leaves from plants | - |
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| deforestation | (noun) the removal of trees | Synonyms: disforestation |
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| (noun) the state of being clear of trees | - |
| deformation | (noun) the act of twisting or deforming the shape of something (e.g., yourself) | Synonyms: contortion |
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| (noun) a change for the worse | Synonyms: distortion |
| (noun) alteration in the shape or dimensions of an object as a result of the application of stress to it | - |
| deformity | (noun) an appearance that has been spoiled or is misshapen | Synonyms: disfiguration, disfigurement |
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| (noun) an affliction in which some part of the body is misshapen or malformed | Synonyms: malformation, misshapenness |
| defrauder | (noun) a person who swindles you by means of deception or fraud | Synonyms: chiseler, chiseller, gouger, grifter, scammer, swindler |
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| defrayal | (noun) the act of paying money | Synonyms: defrayment, payment |
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| defrayment | (noun) the act of paying money | Synonyms: defrayal, payment |
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| defroster | (noun) heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane) | Synonyms: deicer |
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| deftness | (noun) skillful performance or ability without difficulty | Synonyms: adeptness, adroitness, facility, quickness |
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| defunctness | (noun) no longer in existence | Synonyms: extinction |
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| defusing | (noun) the act of deactivating or making ineffective (as a bomb) | Synonyms: deactivation |
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| degaussing | (noun) the process of making a (steel) ship's hull nonmagnetic by producing an opposing magnetic field | - |
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| degeneracy | (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, depravation, depravity, putrefaction |
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| (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, decadency, degeneration |
| degenerate | (noun) a person whose behavior deviates from what is acceptable especially in sexual behavior | Synonyms: deviant, deviate, perv, perve, pervert |
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| degeneration | (noun) passing from a more complex to a simpler biological form | Synonyms: retrogression |
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| (noun) the process of declining from a higher to a lower level of effective power or vitality or essential quality | Synonyms: devolution |
| (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, decadency, degeneracy |
| deglutition | (noun) the act of swallowing | Synonyms: drink, swallow |
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| degradation | (noun) changing to a lower state (a less respected state) | Synonyms: debasement |
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| (noun) a low or downcast state | Synonyms: abasement, abjection |
| degrader | (noun) a person who lowers the quality or character or value (as by adding cheaper metal to coins) | Synonyms: debaser |
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| degras | (noun) a semisolid emulsion produced by the treatment of certain skins with oxidized fish oil, which extracts their soluble albuminoids. | - |
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| degreaser | (noun) a chemical substance that dissolves water-insoluble substances, such as greases and oils. | - |
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| degree | (noun) a position on a scale of intensity or amount or quality | Synonyms: grade, level |
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| (noun) the seriousness of something (e.g., a burn or crime) | - |
| (noun) the highest power of a term or variable | - |
| (noun) an award conferred by a college or university signifying that the recipient has satisfactorily completed a course of study | Synonyms: academic degree |
| (noun) a measure for arcs and angles | Synonyms: arcdegree |
| (noun) a unit of temperature on a specified scale | - |
| (noun) a specific identifiable position in a continuum or series or especially in a process | Synonyms: level, point, stage |
| degustation | (noun) taking a small amount into the mouth to test its quality | Synonyms: relishing, savoring, savouring, tasting |
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| dehiscence | (noun) (biology) release of material by splitting open of an organ or tissue; the natural bursting open at maturity of a fruit or other reproductive body to release seeds or spores or the bursting open of a surgically closed wound | - |
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| dehumanisation | (noun) the act of degrading people with respect to their best qualities | Synonyms: dehumanization |
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| dehumanization | (noun) the act of degrading people with respect to their best qualities | Synonyms: dehumanisation |
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| dehumidifier | (noun) an appliance to extract moisture from the air and make the environment more comfortable | - |
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| dehydration | (noun) the process of extracting moisture | Synonyms: desiccation, drying up, evaporation |
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| (noun) dryness resulting from the removal of water | Synonyms: desiccation |
| (noun) depletion of bodily fluids | - |
| dehydroretinol | (noun) a viscous alcohol that is less active in mammals than is vitamin A1 | Synonyms: vitamin A2 |
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| deicer | (noun) heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane) | Synonyms: defroster |
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| deictic | (noun) a word specifying identity or spatial or temporal location from the perspective of a speaker or hearer in the context in which the communication occurs | Synonyms: deictic word |
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| deification | (noun) the elevation of a person (as to the status of a god) | Synonyms: apotheosis, exaltation |
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| (noun) an embodiment of the qualities of a god | - |
| (noun) the condition of being treated like a god | - |
| deinocheirus | (noun) lightly built medium-sized theropod with long limbs and neck | - |
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| deinonychus | (noun) swift agile wolf-sized bipedal dinosaur having a large curved claw on each hind foot; of the Cretaceous | - |
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| deipnosophist | (noun) someone skilled at informal chitchat | - |
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| deism | (noun) the form of theological rationalism that believes in God on the basis of reason without reference to revelation | Synonyms: free thought |
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| deist | (noun) a person who believes that God created the universe and then abandoned it | - |
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| deity | (noun) any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force | Synonyms: divinity, god, immortal |
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| deixis | (noun) the function of pointing or specifying from the perspective of a participant in an act of speech or writing; aspects of a communication whose interpretation depends on knowledge of the context in which the communication occurs | - |
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| dejectedness | (noun) a feeling of low spirits | Synonyms: dispiritedness, downheartedness, low-spiritedness, lowness |
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| dejection | (noun) a state of melancholy depression | - |
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| (noun) solid excretory product evacuated from the bowels | Synonyms: BM, faecal matter, faeces, fecal matter, feces, ordure, stool |
| dejeuner | (noun) a midday meal | Synonyms: lunch, luncheon, tiffin |
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| dekagram | (noun) 10 grams | Synonyms: dag, decagram, dkg |
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| dekaliter | (noun) a metric unit of volume or capacity equal to 10 liters | Synonyms: dal, decaliter, decalitre, dekalitre, dkl |
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| dekalitre | (noun) a metric unit of volume or capacity equal to 10 liters | Synonyms: dal, decaliter, decalitre, dekaliter, dkl |
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| dekameter | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, decametre, dekametre, dkm |
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| dekametre | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, decametre, dekameter, dkm |
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| dekko | (noun) British slang for a look | - |
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| delabialization | (noun) the pronouncing of a sound without lip rounding. | - |
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| delavirdine | (noun) a non-nucleoside reverse transcriptase inhibitor (trade name Rescriptor) used to treat AIDS and HIV | Synonyms: Rescriptor |
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| delay | (noun) the act of delaying; inactivity resulting in something being put off until a later time | Synonyms: holdup |
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| (noun) time during which some action is awaited | Synonyms: hold, postponement, time lag, wait |
| delayer | (noun) a person who delays; to put off until later or cause to be late | - |
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| delectability | (noun) extreme appetizingness | Synonyms: deliciousness, lusciousness, toothsomeness |
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| delectation | (noun) act of receiving pleasure from something | Synonyms: enjoyment |
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| (noun) a feeling of extreme pleasure or satisfaction | Synonyms: delight |
| delegacy | (noun) the appointment of a delegate | - |
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| (noun) a group of representatives or delegates | Synonyms: commission, delegation, deputation, mission |
| (noun) the state of serving as an official and authorized delegate or agent | Synonyms: agency, representation |
| delegate | (noun) a person appointed or elected to represent others | - |
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| delegating | (noun) authorizing subordinates to make certain decisions | Synonyms: delegation, deputation, relegating, relegation |
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| delegation | (noun) authorizing subordinates to make certain decisions | Synonyms: delegating, deputation, relegating, relegation |
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| (noun) a group of representatives or delegates | Synonyms: commission, delegacy, deputation, mission |
| deletion | (noun) the act of deleting something written or printed | - |
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| (noun) the omission that is made when an editorial change shortens a written passage | Synonyms: cut, excision |
| (noun) (genetics) the loss or absence of one or more nucleotides from a chromosome | - |
| (noun) any process whereby sounds or words are left out of spoken words or phrases | Synonyms: omission |
| delf | (noun) an excavation; usually a quarry or mine | - |
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| delft | (noun) a style of glazed earthenware; usually white with blue decoration | - |
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