| illuminance | (noun) the luminous flux incident on a unit area | Synonyms: illumination |
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| imbalance | (noun) lack of proportion; imbalance among the parts of something | Synonyms: disproportion, dissymmetry |
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| (noun) a lack of balance or state of disequilibrium | Synonyms: instability, unbalance |
| immanence | (noun) the state of being within or not going beyond a given domain | Synonyms: immanency |
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| imminence | (noun) the state of being imminent and liable to happen soon | Synonyms: forthcomingness, imminency, imminentness, impendence, impendency |
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| immunocompetence | (noun) the ability to develop an immune response following exposure to an antigen | - |
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| immunofluorescence | (noun) (immunology) a technique that uses antibodies linked to a fluorescent dye in order to study antigens in a sample of tissue | - |
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| impatience | (noun) a dislike of anything that causes delay | - |
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| (noun) a restless desire for change and excitement | - |
| (noun) a lack of patience; irritation with anything that causes delay | Synonyms: restlessness |
| impedance | (noun) a material's opposition to the flow of electric current; measured in ohms | Synonyms: electric resistance, electrical resistance, ohmic resistance, resistance, resistivity |
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| impendence | (noun) the state of being imminent and liable to happen soon | Synonyms: forthcomingness, imminence, imminency, imminentness, impendency |
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| impenitence | (noun) the trait of refusing to repent | Synonyms: impenitency |
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| impermanence | (noun) the property of not existing for indefinitely long durations | Synonyms: impermanency |
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| impertinence | (noun) inappropriate playfulness | Synonyms: archness, perkiness, pertness, sauciness |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impudence, insolence |
| (noun) an impudent statement | Synonyms: cheek, impudence |
| importance | (noun) the quality of being important and worthy of note | - |
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| (noun) a prominent status | Synonyms: grandness |
| impotence | (noun) the quality of lacking strength or power; being weak and feeble | Synonyms: impotency, powerlessness |
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| (noun) an inability (usually of the male animal) to copulate | Synonyms: impotency |
| improvidence | (noun) a lack of prudence and care by someone in the management of resources | Synonyms: shortsightedness |
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| imprudence | (noun) a lack of caution in practical affairs | - |
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| impudence | (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, insolence |
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| (noun) an impudent statement | Synonyms: cheek, impertinence |
| impuissance | (noun) powerlessness revealed by an inability to act | Synonyms: helplessness, weakness |
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| inadvertence | (noun) the trait of forgetting or ignoring your responsibilities | Synonyms: heedlessness, inadvertency, unmindfulness |
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| (noun) an unintentional omission resulting from failure to notice something | Synonyms: oversight |
| incalescence | (noun) the property of being warming | Synonyms: calefaction |
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| incandescence | (noun) light from heat | - |
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| (noun) the phenomenon of light emission by a body as its temperature is raised | Synonyms: glow |
| incidence | (noun) the striking of a light beam on a surface | - |
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| (noun) the relative frequency of occurrence of something | Synonyms: relative incidence |
| incipience | (noun) beginning to exist or to be apparent | Synonyms: incipiency |
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| incognizance | (noun) a lack of knowledge or recognition | - |
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| incoherence | (noun) nonsense that is simply incoherent and unintelligible | Synonyms: incoherency, unintelligibility |
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| (noun) lack of cohesion or clarity or organization | Synonyms: incoherency |
| incompetence | (noun) lack of physical or intellectual ability or qualifications | Synonyms: incompetency |
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| (noun) inability of a part or organ to function properly | - |
| inconsequence | (noun) having no important effects or influence | - |
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| (noun) invalid or incorrect reasoning | Synonyms: illogic, illogicality, illogicalness |
| incontinence | (noun) indiscipline with regard to sensuous pleasures | Synonyms: dissoluteness, self-gratification |
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| (noun) involuntary urination or defecation | Synonyms: incontinency |
| inconvenience | (noun) the quality of not being useful or convenient | - |
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| (noun) a difficulty that causes anxiety | Synonyms: troublesomeness, worriment |
| (noun) an inconvenient discomfort | Synonyms: incommodiousness |
| incumbrance | (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, interference, preventative, preventive |
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| (noun) an onerous or difficult concern | Synonyms: burden, encumbrance, load, onus |
| (noun) a charge against property (as a lien or mortgage) | Synonyms: encumbrance |
| incurrence | (noun) the act of incurring (making yourself subject to something undesirable) | - |
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| independence | (noun) the successful ending of the American Revolution | - |
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| (noun) freedom from control or influence of another or others | Synonyms: independency |
| indifference | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: apathy, numbness, spiritlessness |
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| (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: nonchalance, unconcern |
| (noun) unbiased impartial unconcern | - |
| (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassiveness, impassivity, phlegm, stolidity, unemotionality |
| indigence | (noun) a state of extreme poverty or destitution | Synonyms: need, pauperism, pauperization, penury |
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| indolence | (noun) inactivity resulting from a dislike of work | Synonyms: laziness |
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| inductance | (noun) an electrical device (typically a conducting coil) that introduces inductance into a circuit | Synonyms: inductor |
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| (noun) an electrical phenomenon whereby an electromotive force (EMF) is generated in a closed circuit by a change in the flow of current | Synonyms: induction |
| indulgence | (noun) the act of indulging or gratifying a desire | Synonyms: humoring, humouring, indulging, pampering |
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| (noun) foolish or senseless behavior | Synonyms: craziness, folly, foolery, lunacy, tomfoolery |
| (noun) the remission by the pope of the temporal punishment in purgatory that is still due for sins even after absolution | - |
| (noun) an inability to resist the gratification of whims and desires | Synonyms: self-indulgence |
| (noun) a disposition to yield to the wishes of someone | Synonyms: lenience, leniency |
| inelegance | (noun) the quality of lacking refinement and good taste | - |
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| inexpedience | (noun) the quality of being unsuited to the end in view | Synonyms: inexpediency |
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| inexperience | (noun) lack of experience and the knowledge and understanding derived from experience | Synonyms: rawness |
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| inference | (noun) the reasoning involved in drawing a conclusion or making a logical judgment on the basis of circumstantial evidence and prior conclusions rather than on the basis of direct observation | Synonyms: illation |
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| inflorescence | (noun) the flowering part of a plant or arrangement of flowers on a stalk | - |
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| (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, efflorescence, florescence, flowering |
| influence | (noun) causing something without any direct or apparent effort | - |
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| (noun) a power to affect persons or events especially power based on prestige etc | - |
| (noun) a cognitive factor that tends to have an effect on what you do | - |
| (noun) one having power to influence another | - |
| (noun) the effect of one thing (or person) on another | - |
| infructescence | (noun) the fruiting stage of the inflorescence | - |
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| inherence | (noun) the state of inhering; the state of being a fixed characteristic | Synonyms: inherency |
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| inheritance | (noun) hereditary succession to a title or an office or property | Synonyms: heritage |
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| (noun) any attribute or immaterial possession that is inherited from ancestors | Synonyms: heritage |
| (noun) (genetics) attributes acquired via biological heredity from the parents | Synonyms: hereditary pattern |
| (noun) that which is inherited; a title or property or estate that passes by law to the heir on the death of the owner | Synonyms: heritage |
| injustice | (noun) an unjust act | Synonyms: iniquity, shabbiness, unfairness |
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| (noun) the practice of being unjust or unfair | Synonyms: unjustness |
| innocence | (noun) the quality of innocent naivete | Synonyms: artlessness, ingenuousness, naturalness |
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| (noun) a state or condition of being innocent of a specific crime or offense | - |
| (noun) the state of being unsullied by sin or moral wrong; lacking a knowledge of evil | Synonyms: pureness, purity, sinlessness, whiteness |
| insentience | (noun) lacking consciousness or ability to perceive sensations | - |
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| insignificance | (noun) the quality of having little or no significance | - |
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| insistence | (noun) the act of insisting on something | Synonyms: insistency |
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| (noun) continual and persistent demands | Synonyms: insisting |
| (noun) the state of demanding notice or attention | Synonyms: imperativeness, insistency, press, pressure |
| insolence | (noun) an offensive disrespectful impudent act | - |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, impudence |
| insouciance | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, lightheartedness, lightsomeness |
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| instance | (noun) an item of information that is typical of a class or group | Synonyms: example, illustration, representative |
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| (noun) an occurrence of something | Synonyms: case, example |
| insurance | (noun) written contract or certificate of insurance | Synonyms: insurance policy, policy |
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| (noun) promise of reimbursement in the case of loss; paid to people or companies so concerned about hazards that they have made prepayments to an insurance company | - |
| (noun) protection against future loss | Synonyms: indemnity |
| insurgence | (noun) an organized rebellion aimed at overthrowing a constituted government through the use of subversion and armed conflict | Synonyms: insurgency |
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| intelligence | (noun) the operation of gathering information about an enemy | Synonyms: intelligence activity, intelligence operation |
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| (noun) the ability to comprehend; to understand and profit from experience | - |
| (noun) information about recent and important events | Synonyms: news, tidings, word |
| (noun) secret information about an enemy (or potential enemy) | Synonyms: intelligence information |
| (noun) a unit responsible for gathering and interpreting information about an enemy | Synonyms: intelligence agency, intelligence service |
| intemperance | (noun) excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence | Synonyms: intemperateness, self-indulgence |
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| (noun) consumption of alcoholic drinks | Synonyms: intemperateness |
| (noun) the quality of being intemperate | - |
| interdependence | (noun) a reciprocal relation between interdependent entities (objects or individuals or groups) | Synonyms: interdependency, mutuality |
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| interface | (noun) (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases) | - |
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| (noun) (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals) | Synonyms: port |
| (noun) the overlap where two theories or phenomena affect each other or have links with each other | - |
| (noun) (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system | Synonyms: user interface |
| interference | (noun) the act of hindering or obstructing or impeding | Synonyms: hinderance, hindrance |
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| (noun) (American football) blocking a player's path with your body | - |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, preventative, preventive |
| (noun) a policy of intervening in the affairs of other countries | Synonyms: intervention |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, noise |
| intermittence | (noun) the quality of being intermittent; subject to interruption or periodic stopping | Synonyms: intermittency |
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| interstice | (noun) small opening between things | - |
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| (noun) a small structural space between tissues or parts of an organ | - |
| intolerance | (noun) impatience with annoyances | - |
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| (noun) unwillingness to recognize and respect differences in opinions or beliefs | - |
| intransigence | (noun) the trait of being intransigent; stubbornly refusing to compromise | Synonyms: intransigency |
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| intumescence | (noun) the increase in volume of certain substances when they are heated (often accompanied by release of water) | Synonyms: intumescency, swelling |
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| (noun) swelling up with blood or other fluids (as with congestion) | Synonyms: intumescency |
| invariance | (noun) the quality of being resistant to variation | Synonyms: invariability, invariableness |
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| (noun) the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it | - |
| invoice | (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: account, bill |
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| iridescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: opalescence |
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| irrelevance | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevancy |
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| irreverence | (noun) a disrespectful act | Synonyms: violation |
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| (noun) an irreverent mental attitude | - |
| issuance | (noun) the act of providing an item for general use or for official purposes (usually in quantity) | Synonyms: issue, issuing |
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| jaundice | (noun) a rough and bitter manner | Synonyms: acerbity, acrimony, bitterness, tartness, thorniness |
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| (noun) yellowing of the skin and the whites of the eyes caused by an accumulation of bile pigment (bilirubin) in the blood; can be a symptom of gallstones or liver infection or anemia | Synonyms: icterus |
| jounce | (noun) a sudden jarring impact | Synonyms: jar, jolt, shock |
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| jubilance | (noun) a feeling of extreme joy | Synonyms: exultation, jubilancy, jubilation |
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| juice | (noun) any of several liquids of the body | Synonyms: succus |
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| (noun) the liquid part that can be extracted from plant or animal tissue by squeezing or cooking | - |
| (noun) electric current | - |
| (noun) energetic vitality | - |
| jurisprudence | (noun) the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do | Synonyms: law, legal philosophy |
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| (noun) the collection of rules imposed by authority | Synonyms: law |
| justice | (noun) judgment involved in the determination of rights and the assignment of rewards and punishments | - |
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| (noun) the quality of being just or fair | Synonyms: justness |
| (noun) a public official authorized to decide questions brought before a court of justice | Synonyms: judge, jurist |
| juvenescence | (noun) the process of growing into a youth | - |
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| lace | (noun) a delicate decorative fabric woven in an open web of symmetrical patterns | - |
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| (noun) a cord that is drawn through eyelets or around hooks in order to draw together two edges (as of a shoe or garment) | Synonyms: lacing |
| lance | (noun) a long pointed rod used as a tool or weapon | Synonyms: shaft, spear |
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| (noun) an implement with a shaft and barbed point used for catching fish | Synonyms: fishgig, fizgig, gig, spear |
| (noun) a surgical knife with a pointed double-edged blade; used for punctures and small incisions | Synonyms: lancet |
| lattice | (noun) framework consisting of an ornamental design made of strips of wood or metal | Synonyms: fretwork, latticework |
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| (noun) small opening (like a window in a door) through which business can be transacted | Synonyms: grille, wicket |
| (noun) an arrangement of points or particles or objects in a regular periodic pattern in 2 or 3 dimensions | - |
| launce | (noun) very small silvery eellike schooling fishes that burrow into sandy beaches | Synonyms: sand eel, sand lance, sand launce |
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| lenience | (noun) lightening a penalty or excusing from a chore by judges or parents or teachers | Synonyms: leniency |
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| (noun) mercifulness as a consequence of being lenient or tolerant | Synonyms: leniency, lenity, mildness |
| (noun) a disposition to yield to the wishes of someone | Synonyms: indulgence, leniency |
| lettuce | (noun) leaves of any of various plants of Lactuca sativa | - |
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| (noun) any of various plants of the genus Lactuca | - |
| (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dinero, dough, gelt, kale, lolly, loot, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
| licence | (noun) a legal document giving official permission to do something | Synonyms: license, permit |
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| (noun) freedom to deviate deliberately from normally applicable rules or practices (especially in behavior or speech) | Synonyms: license |
| (noun) excessive freedom; lack of due restraint | Synonyms: license |
| licorice | (noun) a black candy flavored with the dried root of the licorice plant | Synonyms: liquorice |
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| (noun) deep-rooted coarse-textured plant native to the Mediterranean region having blue flowers and pinnately compound leaves; widely cultivated in Europe for its long thick sweet roots | Synonyms: Glycyrrhiza glabra, liquorice |
| liquorice | (noun) a black candy flavored with the dried root of the licorice plant | Synonyms: licorice |
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| (noun) deep-rooted coarse-textured plant native to the Mediterranean region having blue flowers and pinnately compound leaves; widely cultivated in Europe for its long thick sweet roots | Synonyms: Glycyrrhiza glabra, licorice |
| luminance | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminosity, luminousness |
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| luminescence | (noun) light from nonthermal sources | Synonyms: glow |
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| (noun) light not due to incandescence; occurs at low temperatures | - |
| luxuriance | (noun) the property of being lush and abundant and a pleasure to the senses | Synonyms: lushness, voluptuousness |
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| mace | (noun) a ceremonial staff carried as a symbol of office or authority | - |
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| (noun) spice made from the dried fleshy covering of the nutmeg seed | - |
| (noun) an official who carries a mace of office | Synonyms: macebearer, macer |
| magnificence | (noun) the quality of being magnificent or splendid or grand | Synonyms: brilliance, grandeur, grandness, splendor, splendour |
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| (noun) splendid or imposing in size or appearance | Synonyms: grandness, impressiveness, richness |
| magniloquence | (noun) high-flown style; excessive use of verbal ornamentation | Synonyms: grandiloquence, grandiosity, ornateness, rhetoric |
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| maintenance | (noun) activity involved in maintaining something in good working order | Synonyms: care, upkeep |
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| (noun) the act of sustaining life by food or providing a means of subsistence | Synonyms: sustainment, sustenance, sustentation, upkeep |
| (noun) the unauthorized interference in a legal action by a person having no interest in it (as by helping one party with money or otherwise to continue the action) so as to obstruct justice or promote unnecessary litigation or unsettle the peace of the community | Synonyms: criminal maintenance |
| (noun) means of maintenance of a family or group | - |
| (noun) court-ordered support paid by one spouse to another after they are separated | Synonyms: alimony |
| maleficence | (noun) the quality or nature of being harmful or evil | Synonyms: balefulness, mischief |
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| (noun) doing or causing evil | - |
| malevolence | (noun) the quality of threatening evil | Synonyms: malevolency, malice |
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| (noun) wishing evil to others | Synonyms: malignity |
| malfeasance | (noun) wrongful conduct by a public official | - |
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| malice | (noun) the quality of threatening evil | Synonyms: malevolence, malevolency |
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| (noun) feeling a need to see others suffer | Synonyms: maliciousness, spite, spitefulness, venom |
| malignance | (noun) quality of being disposed to evil; intense ill will | Synonyms: malignancy, malignity |
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| (noun) (medicine) a malignant state; progressive and resistant to treatment and tending to cause death | Synonyms: malignancy |