| insignificant | (adjective) devoid of importance, meaning, or force | Synonyms: unimportant |
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| (adjective) signifying nothing | - |
| (adjective) of little importance or influence or power; of minor status | Synonyms: peanut |
| (adjective) small and unimpressive | Synonyms: dinky |
| insistent | (adjective) repetitive and persistent | Synonyms: repetitive |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, instant |
| insolent | (adjective) marked by casual disrespect | Synonyms: flip, impudent, snotty-nosed |
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| (adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen |
| insolvent | (adjective) unable to meet or discharge financial obligations | - |
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| (noun) someone who has insufficient assets to cover their debts | Synonyms: bankrupt |
| insouciant | (adjective) marked by blithe unconcern | Synonyms: casual, nonchalant |
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| installment | (noun) the act of installing something (as equipment) | Synonyms: installation, installing, instalment |
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| (noun) a part of a broadcast serial | Synonyms: episode, instalment |
| (noun) a part of a published serial | Synonyms: instalment |
| (noun) a payment of part of a debt; usually paid at regular intervals | - |
| instalment | (noun) the act of installing something (as equipment) | Synonyms: installation, installing, installment |
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| (noun) a part of a broadcast serial | Synonyms: episode, installment |
| (noun) a part of a published serial | Synonyms: installment |
| instant | (adjective) occurring with no delay | Synonyms: instantaneous |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, insistent |
| (adjective) in or of the present month | Synonyms: inst |
| (noun) a particular point in time | Synonyms: minute, moment, second |
| (noun) a very short time (as the time it takes the eye to blink or the heart to beat) | Synonyms: blink of an eye, flash, heartbeat, jiffy, New York minute, split second, trice, twinkling, wink |
| instigant | (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigator, provoker |
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| instillment | (noun) the introduction of a liquid (by pouring or injection) drop by drop | Synonyms: instillation, instilment |
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| instilment | (noun) the introduction of a liquid (by pouring or injection) drop by drop | Synonyms: instillation, instillment |
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| instrument | (noun) the means whereby some act is accomplished | Synonyms: tool |
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| (noun) a device that requires skill for proper use | - |
| (noun) any of various devices or contrivances that can be used to produce musical tones or sounds | Synonyms: musical instrument |
| (noun) (law) a document that states some contractual relationship or grants some right | Synonyms: legal document, legal instrument, official document |
| (noun) the semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process | Synonyms: instrumental role |
| (noun) a person used by another to gain an end | Synonyms: cat's-paw, pawn |
| (verb) address a legal document to | - |
| (verb) write an instrumental score for | Synonyms: instrumentate |
| (verb) equip with instruments for measuring, recording, or controlling | - |
| insufficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: deficient |
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| insulant | (noun) insulating material that reduces or prevents the transmission of heat or sound or electricity | Synonyms: insulation |
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| insurgent | (adjective) in opposition to a civil authority or government | Synonyms: seditious, subversive |
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| (noun) a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions) | Synonyms: freedom fighter, insurrectionist, rebel |
| (noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment | Synonyms: guerilla, guerrilla, irregular |
| integument | (noun) an outer protective covering such as the skin of an animal or a cuticle or seed coat or rind or shell | - |
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| intelligent | (adjective) having the capacity for thought and reason especially to a high degree | - |
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| (adjective) endowed with the capacity to reason | Synonyms: reasoning, thinking |
| (adjective) exercising or showing good judgment | Synonyms: healthy, level-headed, levelheaded, sound |
| (adjective) possessing sound knowledge | Synonyms: well-informed |
| intent | (adjective) giving or marked by complete attention to | Synonyms: absorbed, captive, engrossed, enwrapped, rapt, wrapped |
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| (noun) an anticipated outcome that is intended or that guides your planned actions | Synonyms: aim, design, intention, purpose |
| (noun) the intended meaning of a communication | Synonyms: purport, spirit |
| interdependent | (adjective) mutually dependent | Synonyms: mutualist, mutually beneficial |
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| interment | (noun) the ritual placing of a corpse in a grave | Synonyms: burial, entombment, inhumation, sepulture |
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| intermittent | (adjective) stopping and starting at irregular intervals | - |
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| internment | (noun) the act of confining someone in a prison (or as if in a prison) | Synonyms: imprisonment |
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| (noun) placing private property in the custody of an officer of the law | Synonyms: impounding, impoundment, poundage |
| (noun) confinement during wartime | - |
| intersectant | (adjective) crossed or intersected in the form of an X | Synonyms: decussate, intersecting |
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| intolerant | (adjective) unwilling to tolerate difference of opinion | - |
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| (adjective) narrow-minded about cherished opinions | Synonyms: illiberal |
| intoxicant | (adjective) causing intoxication | Synonyms: intoxicating |
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| (noun) a drug that can produce a state of intoxication | - |
| (noun) a liquor or brew containing alcohol as the active agent | Synonyms: alcohol, alcoholic beverage, alcoholic drink, inebriant |
| intransigent | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, inexorable |
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| intrenchment | (noun) an entrenched fortification; a position protected by trenches | Synonyms: entrenchment |
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| intumescent | (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, puffy, swollen, tumescent, tumid, turgid |
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| invariant | (adjective) unvarying in nature | Synonyms: changeless, constant, unvarying |
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| (adjective) unaffected by a designated operation or transformation | - |
| (noun) a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it | - |
| invent | (verb) come up with (an idea, plan, explanation, theory, or principle) after a mental effort | Synonyms: contrive, devise, excogitate, forge, formulate |
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| (verb) concoct something artificial or untrue | Synonyms: cook up, fabricate, make up, manufacture |
| investment | (noun) the act of investing; laying out money or capital in an enterprise with the expectation of profit | Synonyms: investing |
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| (noun) the act of putting on robes or vestments | - |
| (noun) the ceremonial act of clothing someone in the insignia of an office; the formal promotion of a person to an office or rank | Synonyms: investiture |
| (noun) outer layer or covering of an organ or part or organism | - |
| (noun) the commitment of something other than money (time, energy, or effort) to a project with the expectation of some worthwhile result | - |
| (noun) money that is invested with an expectation of profit | Synonyms: investment funds |
| involvement | (noun) the act of sharing in the activities of a group | Synonyms: engagement, involution, participation |
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| (noun) a sense of concern with and curiosity about someone or something | Synonyms: interest |
| (noun) a connection of inclusion or containment | - |
| (noun) a usually secretive or illicit sexual relationship | Synonyms: affair, affaire, amour, intimacy, liaison |
| (noun) the condition of sharing in common with others (as fellows or partners etc.) | Synonyms: participation |
| iridescent | (adjective) having a play of lustrous rainbow colors | Synonyms: nacreous, opalescent, opaline, pearlescent |
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| (adjective) varying in color when seen in different lights or from different angles | Synonyms: changeable, chatoyant, shot |
| irrelevant | (adjective) having no bearing on or connection with the subject at issue | - |
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| irreverent | (adjective) showing lack of due respect or veneration | - |
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| (adjective) not revering god | Synonyms: godless |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: impertinent, pert, saucy |
| irritant | (noun) something that causes irritation and annoyance | Synonyms: thorn |
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| isobront | (noun) a line drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously. | - |
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| itinerant | (adjective) traveling from place to place to work | - |
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| (noun) a laborer who moves from place to place as demanded by employment | Synonyms: gipsy, gypsy |
| jaunt | (noun) a journey taken for pleasure | Synonyms: excursion, expedition, junket, outing, pleasure trip, sashay |
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| (verb) make a trip for pleasure | Synonyms: travel, trip |
| joint | (adjective) united or combined | - |
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| (adjective) involving both houses of a legislature | - |
| (adjective) affecting or involving two or more | - |
| (noun) marijuana leaves rolled into a cigarette for smoking | Synonyms: marijuana cigarette, reefer, spliff, stick |
| (noun) junction by which parts or objects are joined together | - |
| (noun) a disreputable place of entertainment | - |
| (noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) | Synonyms: articulatio, articulation |
| (noun) a piece of meat roasted or for roasting and of a size for slicing into more than one portion | Synonyms: roast |
| (noun) the shape or manner in which things come together and a connection is made | Synonyms: articulation, join, junction, juncture |
| (verb) fasten with a joint | - |
| (verb) separate (meat) at the joint | - |
| (verb) provide with a joint | Synonyms: articulate |
| (verb) fit as if by joints | - |
| jubilant | (adjective) joyful and proud especially because of triumph or success | Synonyms: exultant, exulting, prideful, rejoicing, triumphal, triumphant |
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| (adjective) full of high-spirited delight | Synonyms: elated, gleeful, joyful |
| judgement | (noun) (law) the determination by a court of competent jurisdiction on matters submitted to it | Synonyms: judgment, judicial decision |
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| (noun) the act of judging or assessing a person or situation or event | Synonyms: assessment, judgment |
| (noun) the capacity to assess situations or circumstances shrewdly and to draw sound conclusions | Synonyms: judgment, perspicacity, sound judgement, sound judgment |
| (noun) the cognitive process of reaching a decision or drawing conclusions | Synonyms: judging, judgment |
| (noun) the mental ability to understand and discriminate between relations | Synonyms: discernment, judgment, sagaciousness, sagacity |
| (noun) an opinion formed by judging something | Synonyms: judgment, mind |
| (noun) the legal document stating the reasons for a judicial decision | Synonyms: judgment, legal opinion, opinion |
| judgment | (noun) (law) the determination by a court of competent jurisdiction on matters submitted to it | Synonyms: judgement, judicial decision |
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| (noun) the act of judging or assessing a person or situation or event | Synonyms: assessment, judgement |
| (noun) the capacity to assess situations or circumstances shrewdly and to draw sound conclusions | Synonyms: judgement, perspicacity, sound judgement, sound judgment |
| (noun) the cognitive process of reaching a decision or drawing conclusions | Synonyms: judgement, judging |
| (noun) the mental ability to understand and discriminate between relations | Synonyms: discernment, judgement, sagaciousness, sagacity |
| (noun) an opinion formed by judging something | Synonyms: judgement, mind |
| (noun) the legal document stating the reasons for a judicial decision | Synonyms: judgement, legal opinion, opinion |
| jument | (noun) an animal such as a donkey or ox or elephant used for transporting loads or doing other heavy work | Synonyms: beast of burden |
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| labyrinthodont | (noun) an amphibian of the superorder Labyrinthodontia | - |
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| lakefront | (noun) land bordering a lake | - |
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| lambent | (adjective) softly bright or radiant | Synonyms: aglow, lucent, luminous |
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| lament | (noun) a mournful poem; a lament for the dead | Synonyms: elegy |
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| (noun) a song or hymn of mourning composed or performed as a memorial to a dead person | Synonyms: coronach, dirge, requiem, threnody |
| (noun) a cry of sorrow and grief | Synonyms: lamentation, plaint, wail |
| (verb) regret strongly | Synonyms: bemoan, bewail, deplore |
| (verb) express grief verbally | Synonyms: keen |
| latent | (adjective) (pathology) not presently active | - |
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| (adjective) potentially existing but not presently evident or realized | - |
| leadplant | (noun) shrub of sandy woodlands and stream banks of western United States having hoary pinnate flowers and dull-colored racemose flowers; thought to indicate the presence of lead ore | Synonyms: Amorpha canescens, lead plant |
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| lenient | (adjective) characterized by tolerance and mercy | - |
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| (adjective) tolerant or lenient | Synonyms: indulgent, soft |
| (adjective) not strict | Synonyms: easy |
| levant | (verb) run off without paying a debt | - |
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| lieutenant | (noun) an officer in a police force | Synonyms: police lieutenant |
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| (noun) a commissioned military officer | - |
| (noun) an assistant with power to act when his superior is absent | Synonyms: deputy |
| (noun) an officer holding a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant commander and above lieutenant junior grade | - |
| ligament | (noun) any connection or unifying bond | - |
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| (noun) a sheet or band of tough fibrous tissue connecting bones or cartilages or supporting muscles or organs | - |
| lineament | (noun) the characteristic parts of a person's face: eyes and nose and mouth and chin | Synonyms: feature |
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| (noun) a characteristic property that defines the apparent individual nature of something | Synonyms: character, quality |
| liniment | (noun) a medicinal liquid that is rubbed into the skin to relieve muscular stiffness and pain | Synonyms: embrocation |
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| lint | (noun) cotton or linen fabric with the nap raised on one side; used to dress wounds | - |
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| (noun) fine ravellings of cotton or linen fibers | - |
| liquescent | (adjective) becoming liquid | Synonyms: melting |
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| litigant | (noun) (law) a party to a lawsuit; someone involved in litigation | Synonyms: litigator |
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| lodgement | (noun) the state or quality of being lodged or fixed even temporarily | Synonyms: lodging, lodgment |
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| lodgment | (noun) the state or quality of being lodged or fixed even temporarily | Synonyms: lodgement, lodging |
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| loment | (noun) seedpods that are constricted between the seeds and that break apart when mature into single-seeded segments | - |
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| lubricant | (noun) a substance capable of reducing friction by making surfaces smooth or slippery | Synonyms: lube, lubricating substance, lubricator |
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| lucent | (adjective) softly bright or radiant | Synonyms: aglow, lambent, luminous |
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| luculent | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, limpid, lucid, pellucid, perspicuous |
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| luminescent | (adjective) emitting light not caused by heat | - |
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| luxuriant | (adjective) produced or growing in extreme abundance | Synonyms: exuberant, lush, profuse, riotous |
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| (adjective) marked by complexity and richness of detail | Synonyms: elaborate |
| (adjective) displaying luxury and furnishing gratification to the senses | Synonyms: epicurean, luxurious, sybaritic, voluptuary, voluptuous |
| macroelement | (noun) a chemical element required in relatively large quantities for the normal physiologic processes of the body. | Synonyms: major mineral |
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| magnificent | (adjective) characterized by grandeur | Synonyms: brilliant, glorious, splendid |
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| magniloquent | (adjective) lofty in style | Synonyms: grandiloquent, tall |
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| maidservant | (noun) a female domestic | Synonyms: amah, housemaid, maid |
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| maladjustment | (noun) the condition of being unable to adapt properly to your environment with resulting emotional instability | - |
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| malcontent | (adjective) discontented as toward authority | Synonyms: disaffected, ill-affected, rebellious |
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| (noun) a person who is discontented or disgusted | - |
| maleficent | (adjective) harmful or evil in intent or effect | - |
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| malevolent | (adjective) having or exerting a malignant influence | Synonyms: evil, malefic, malign |
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| (adjective) wishing or appearing to wish evil to others; arising from intense ill will or hatred | - |
| malfeasant | (noun) one guilty of malfeasance | - |
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| malignant | (adjective) dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor) | - |
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| malignment | (noun) slanderous defamation | Synonyms: smear, vilification |
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| malnourishment | (noun) not having enough food to develop or function normally | Synonyms: undernourishment |
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| maltreatment | (noun) cruel or inhumane treatment | Synonyms: abuse, ill-treatment, ill-usage |
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| management | (noun) the act of managing something | Synonyms: direction |
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| (noun) those in charge of running a business | - |
| manhunt | (noun) an organized search (by police) for a person (charged with a crime) | - |
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| manservant | (noun) a man servant | - |
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| mastodont | (noun) extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth | Synonyms: mastodon |
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| maturement | (noun) coming to full development; becoming mature | Synonyms: maturation, ripening |
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| measurement | (noun) the act or process of assigning numbers to phenomena according to a rule | Synonyms: measure, measuring, mensuration |
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| mediant | (noun) (music) the third note of a diatonic scale; midway between the tonic and the dominant | - |
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| medicament | (noun) (medicine) something that treats or prevents or alleviates the symptoms of disease | Synonyms: medication, medicinal drug, medicine |
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| mellisonant | (adjective) pleasing to the ear | Synonyms: dulcet, honeyed, mellifluous, sweet |
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| mendicant | (adjective) practicing beggary | - |
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| (noun) a pauper who lives by begging | Synonyms: beggar |
| (noun) a male member of a religious order that originally relied solely on alms | Synonyms: friar |
| merchant | (noun) a businessperson engaged in retail trade | Synonyms: merchandiser |
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| merriment | (noun) activities that are enjoyable or amusing | Synonyms: fun, playfulness |
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| (noun) a gay feeling | Synonyms: gaiety |
| mezzotint | (noun) print produced by an engraving that has been scraped to represent light or shade | - |
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| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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| microprint | (noun) extremely small print, read by a magnifying device. | - |
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| midpoint | (noun) a point equidistant from the ends of a line or the extremities of a figure | Synonyms: center, centre |
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| migrant | (adjective) habitually moving from place to place especially in search of seasonal work | Synonyms: migratory |
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| (noun) traveler who moves from one region or country to another | Synonyms: migrator |
| militainment | (noun) entertainment with military themes in which the Department of Defense is celebrated | - |
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| militant | (adjective) showing a fighting disposition | Synonyms: competitive |
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| (adjective) disposed to warfare or hard-line policies | Synonyms: hawkish, warlike |
| (adjective) engaged in war | Synonyms: belligerent, war-ridden, warring |
| (noun) a militant reformer | Synonyms: activist |
| milliequivalent | (noun) one-thousandth of an equivalent | Synonyms: meq |
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