| extemporisation | (noun) a performance given extempore without planning or preparation | Synonyms: extemporization, improvisation |
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| extemporization | (noun) a performance given extempore without planning or preparation | Synonyms: extemporisation, improvisation |
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| extension | (noun) an educational opportunity provided by colleges and universities to people who are not enrolled as regular students | Synonyms: extension service, university extension |
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| (noun) act of stretching or straightening out a flexed limb | - |
| (noun) act of expanding in scope; making more widely available | - |
| (noun) an addition that extends a main building | Synonyms: annex, annexe, wing |
| (noun) an addition to the length of something | Synonyms: elongation |
| (noun) an additional telephone set that is connected to the same telephone line | Synonyms: extension phone, telephone extension |
| (noun) amount or degree or range to which something extends | Synonyms: lengthiness, prolongation |
| (noun) the ability to raise the working leg high in the air | - |
| (noun) the most direct or specific meaning of a word or expression; the class of objects that an expression refers to | Synonyms: denotation, reference |
| (noun) a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename | Synonyms: file name extension, filename extension |
| (noun) the spreading of something (a belief or practice) into new regions | Synonyms: propagation |
| (noun) a mutually agreed delay in the date set for the completion of a job or payment of a debt | - |
| extensiveness | (noun) large or extensive in breadth or importance or comprehensiveness | Synonyms: largeness |
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| extensor | (noun) a skeletal muscle whose contraction extends or stretches a body part | Synonyms: extensor muscle |
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| extent | (noun) the distance or area or volume over which something extends | - |
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| (noun) the point or degree to which something extends | - |
| extenuation | (noun) to act in such a way as to cause an offense to seem less serious | Synonyms: mitigation, palliation |
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| (noun) a partial excuse to mitigate censure; an attempt to represent an offense as less serious than it appears by showing mitigating circumstances | Synonyms: mitigation |
| exterior | (noun) the outer side or surface of something | Synonyms: outside |
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| (noun) the region that is outside of something | Synonyms: outside |
| exteriorisation | (noun) embodying in an outward form | Synonyms: exteriorization, externalisation, externalization |
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| exteriorization | (noun) embodying in an outward form | Synonyms: exteriorisation, externalisation, externalization |
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| extermination | (noun) the act of exterminating | Synonyms: liquidation |
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| (noun) complete annihilation | Synonyms: extinction |
| exterminator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: eradicator, terminator |
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| extern | (noun) a nonresident doctor or medical student; connected with a hospital but not living there | Synonyms: medical extern |
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| external | (noun) outward features | - |
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| externalisation | (noun) embodying in an outward form | Synonyms: exteriorisation, exteriorization, externalization |
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| (noun) attributing to outside causes | Synonyms: externalization |
| externality | (noun) the quality or state of being outside or directed toward or relating to the outside or exterior | Synonyms: outwardness |
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| externalization | (noun) embodying in an outward form | Synonyms: exteriorisation, exteriorization, externalisation |
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| (noun) attributing to outside causes | Synonyms: externalisation |
| exteroception | (noun) sensitivity to stimuli originating outside of the body | - |
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| exteroceptor | (noun) any receptor that responds to stimuli outside the body | - |
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| extinction | (noun) the act of extinguishing; causing to stop burning | Synonyms: extinguishing, quenching |
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| (noun) a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus | Synonyms: experimental extinction |
| (noun) complete annihilation | Synonyms: extermination |
| (noun) the reduction of the intensity of radiation as a consequence of absorption and radiation | - |
| (noun) no longer in existence | Synonyms: defunctness |
| (noun) no longer active; extinguished | - |
| extinguisher | (noun) a manually operated device for extinguishing small fires | Synonyms: asphyxiator, fire extinguisher |
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| extinguishing | (noun) the act of extinguishing; causing to stop burning | Synonyms: extinction, quenching |
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| extirpation | (noun) surgical removal of a body part or tissue | Synonyms: ablation, cutting out, excision |
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| (noun) the act of pulling up or out; uprooting; cutting off from existence | Synonyms: deracination, excision |
| extirpator | (noun) a farm implement used to remove weeds. | - |
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| extoller | (noun) someone who communicates high praise | Synonyms: laudator, lauder |
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| extolment | (noun) an expression of approval and commendation | Synonyms: congratulations, kudos, praise |
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| extortion | (noun) the felonious act of extorting money (as by threats of violence) | - |
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| (noun) unjust exaction (as by the misuse of authority) | - |
| (noun) an exorbitant charge | - |
| extortioner | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: blackmailer, extortionist |
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| extortionist | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: blackmailer, extortioner |
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| extra | (noun) something additional of the same kind | Synonyms: duplicate |
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| (noun) an additional edition of a newspaper (usually to report a crisis) | - |
| (noun) a minor actor in crowd scenes | Synonyms: spear carrier, supernumerary |
| extract | (noun) a passage selected from a larger work | Synonyms: excerpt, excerption, selection |
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| (noun) a solution obtained by steeping or soaking a substance (usually in water) | Synonyms: infusion |
| extractant | (noun) an immiscible liquid used to extract a substance from another liquid. | - |
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| extraction | (noun) the action of taking out something (especially using effort or force) | - |
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| (noun) properties attributable to your ancestry | Synonyms: descent, origin |
| (noun) the process of obtaining something from a mixture or compound by chemical or physical or mechanical means | - |
| extractivity | (noun) the amount of extract that grains of malt yield. | - |
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| extractor | (noun) an instrument for extracting tight-fitting components | - |
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| (noun) an apparatus that uses centrifugal force to separate particles from a suspension | Synonyms: centrifuge, separator |
| (noun) a mechanism in a firearm that pulls an empty shell case out of the chamber and passes it to the ejector | Synonyms: cartridge extractor, cartridge remover |
| extradition | (noun) the surrender of an accused or convicted person by one state or country to another (usually under the provisions of a statute or treaty) | - |
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| extrados | (noun) the exterior curve of an arch | - |
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| extraneity | (noun) The state of not forming an essential or vital part. | Synonyms: extraneousness |
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| extraneousness | (noun) The state of not forming an essential or vital part. | Synonyms: extraneity |
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| (noun) unrelatedness by virtue of falling outside the matter at hand | - |
| extraordinariness | (noun) the quality of being extraordinary and not commonly encountered | - |
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| extrapolation | (noun) (mathematics) calculation of the value of a function outside the range of known values | - |
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| (noun) an inference about the future (or about some hypothetical situation) based on known facts and observations | - |
| extrasystole | (noun) a premature systole resulting in a momentary cardiac arrhythmia | - |
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| extraterrestrial | (noun) a form of life assumed to exist outside the Earth or its atmosphere | Synonyms: alien, extraterrestrial being |
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| extravagance | (noun) the activity of excessive spending | Synonyms: high life, highlife, lavishness, prodigality |
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| (noun) the trait of spending extravagantly | Synonyms: prodigality, profligacy |
| (noun) the quality of exceeding the appropriate limits of decorum or probability or truth | Synonyms: extravagancy |
| extravagancy | (noun) the quality of exceeding the appropriate limits of decorum or probability or truth | Synonyms: extravagance |
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| extravaganza | (noun) any lavishly staged or spectacular entertainment | - |
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| extravasation | (noun) the process of exuding or passing out of a vessel into surrounding tissues; said of blood or lymph or urine | - |
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| (noun) (of volcanoes) pouring out fumes or lava (or a deposit so formed) | Synonyms: eructation, eruption |
| (noun) an extravasated liquid (blood or lymph or urine); the product of extravasation | - |
| extraversion | (noun) (psychology) an extroverted disposition; concern with what is outside the self | Synonyms: extroversion |
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| extravert | (noun) (psychology) a person concerned more with practical realities than with inner thoughts and feelings | Synonyms: extrovert |
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| extreme | (noun) the furthest or highest degree of something | - |
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| (noun) the point located farthest from the middle of something | Synonyms: extreme point, extremum |
| extremeness | (noun) the quality of being extreme | - |
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| extremism | (noun) any political theory favoring immoderate uncompromising policies | - |
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| extremist | (noun) a person who holds extreme views | - |
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| extremity | (noun) an external body part that projects from the body | Synonyms: appendage, member |
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| (noun) that part of a limb that is farthest from the torso | - |
| (noun) the outermost or farthest region or point | - |
| (noun) the greatest or utmost degree | - |
| (noun) an extreme condition or state (especially of adversity or disease) | - |
| extremum | (noun) the point located farthest from the middle of something | Synonyms: extreme, extreme point |
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| (noun) the most extreme possible amount or value | Synonyms: peak |
| extrication | (noun) the act of releasing from a snarled or tangled condition | Synonyms: disentanglement, unsnarling, untangling |
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| extropy | (noun) the prediction that human intelligence and technology will enable life to expand in an orderly way throughout the entire universe | - |
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| extrospection | (noun) examination or observation of what is outside oneself, as opposed to introspection. | - |
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| extroversion | (noun) (psychology) an extroverted disposition; concern with what is outside the self | Synonyms: extraversion |
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| extrovert | (noun) (psychology) a person concerned more with practical realities than with inner thoughts and feelings | Synonyms: extravert |
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| extrusion | (noun) squeezing out by applying pressure | Synonyms: expulsion |
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| (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bulge, bump, excrescence, gibbosity, gibbousness, hump, jut, prominence, protrusion, protuberance, swelling |