| impetus | (noun) the act of applying force suddenly | Synonyms: impulse, impulsion |
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| (noun) a force that moves something along | Synonyms: drift, impulsion |
| importunate | (adjective) persistent to the point of annoying | - |
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| (adjective) expressing persistant and earnest entreaty | - |
| importunately | (adverb) in a beseeching manner | Synonyms: beseechingly, entreatingly, imploringly, pleadingly |
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| importunateness | (noun) Quality of a person who is given to making importunate demands, being greedily or thoughtlessly demanding. | Synonyms: importunity |
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| importune | (verb) beg persistently and urgently | Synonyms: insist |
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| importunity | (noun) Quality of a person who is given to making importunate demands, being greedily or thoughtlessly demanding. | Synonyms: importunateness |
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| (noun) insistent solicitation and entreaty | Synonyms: urgency, urging |
| imposture | (noun) pretending to be another person | Synonyms: impersonation |
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| imprimatur | (noun) formal and explicit approval | Synonyms: countenance, endorsement, indorsement, sanction, warrant |
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| impromptu | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, off-the-cuff, offhand, offhanded, unrehearsed |
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| (noun) an extemporaneous speech or remark | - |
| (noun) a short musical passage that seems to have been made spontaneously without advance preparation | - |
| (adverb) without advance preparation | Synonyms: ad lib, ad libitum, spontaneously |
| inaptitude | (noun) a lack of aptitude | - |
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| incertitude | (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, uncertainty |
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| incestuous | (adjective) relating to or involving incest | - |
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| (adjective) resembling incest as by excessive intimacy | - |
| incestuously | (adverb) by incest | - |
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| incurvature | (noun) a shape that curves or bends inward | Synonyms: concave shape, concavity, incurvation |
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| indenture | (noun) a contract binding one party into the service of another for a specified term | - |
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| (noun) formal agreement between the issuer of bonds and the bondholders as to terms of the debt | - |
| (noun) the space left between the margin and the start of an indented line | Synonyms: indent, indentation, indention |
| (noun) a concave cut into a surface or edge (as in a coastline) | Synonyms: indentation |
| (verb) bind by or as if by indentures, as of an apprentice or servant | Synonyms: indent |
| indentured | (adjective) bound by contract | Synonyms: apprenticed, articled, bound |
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| indumentum | (noun) a covering of fine hairs (or sometimes scales) as on a leaf or insect | Synonyms: indument |
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| ineffectual | (adjective) not producing an intended effect | Synonyms: ineffective, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffective, unable |
| (adjective) producing no result or effect | Synonyms: futile, meaningless, otiose, unavailing |
| ineffectuality | (noun) lacking the power to be effective | Synonyms: ineffectiveness, ineffectualness |
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| ineffectually | (adverb) in an ineffectual manner | - |
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| ineffectualness | (noun) lacking the power to be effective | Synonyms: ineffectiveness, ineffectuality |
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| ineptitude | (noun) having no qualities that would render it valuable or useful | Synonyms: worthlessness |
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| (noun) unskillfulness resulting from a lack of training | Synonyms: awkwardness, clumsiness, ineptness, maladroitness, slowness |
| inexactitude | (noun) the quality of being inexact | Synonyms: inexactness |
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| infatuate | (verb) arouse unreasoning love or passion in and cause to behave in an irrational way | - |
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| infatuated | (adjective) marked by foolish or unreasoning fondness | Synonyms: enamored, in love, potty, smitten, soft on, taken with |
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| infatuation | (noun) an object of extravagant short-lived passion | - |
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| (noun) a foolish and usually extravagant passion or love or admiration | - |
| (noun) temporary love of an adolescent | Synonyms: calf love, crush, puppy love |
| infinitude | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infiniteness, limitlessness, unboundedness |
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| (noun) an infinite quantity | - |
| infrastructure | (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: base |
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| (noun) the basic structure or features of a system or organization | Synonyms: substructure |
| ingratitude | (noun) a lack of gratitude | Synonyms: ungratefulness |
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| inopportune | (adjective) not opportune | - |
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| inopportunely | (adverb) at an inconvenient time | Synonyms: malapropos |
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| inopportuneness | (noun) the quality of occurring at an inconvenient time | Synonyms: untimeliness |
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| inquietude | (noun) feelings of anxiety that make you tense and irritable | Synonyms: disquietude, edginess, uneasiness |
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| institute | (noun) an association organized to promote art or science or education | - |
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| (verb) advance or set forth in court | Synonyms: bring |
| (verb) set up or lay the groundwork for | Synonyms: constitute, establish, found, plant |
| institution | (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, instauration, introduction, origination |
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| (noun) an establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated | - |
| (noun) a hospital for mentally incompetent or unbalanced person | Synonyms: asylum, insane asylum, mental home, mental hospital, mental institution, psychiatric hospital |
| (noun) a custom that for a long time has been an important feature of some group or society | - |
| (noun) an organization founded and united for a specific purpose | Synonyms: establishment |
| institutional | (adjective) organized as or forming an institution | - |
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| (adjective) relating to or constituting or involving an institution | - |
| (adjective) characteristic or suggestive of an institution especially in being uniform or dull or unimaginative | Synonyms: uninteresting |
| institutionalise | (verb) cause to be admitted; of persons to an institution | Synonyms: charge, commit, institutionalize, send |
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| institutionalised | (adjective) officially placed in or committed to a specialized institution | Synonyms: institutionalized |
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| (adjective) given the character of an institution or incorporated into a structured and usually well-established system | Synonyms: institutionalized |
| institutionalize | (verb) cause to be admitted; of persons to an institution | Synonyms: charge, commit, institutionalise, send |
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| institutionalized | (adjective) officially placed in or committed to a specialized institution | Synonyms: institutionalised |
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| (adjective) given the character of an institution or incorporated into a structured and usually well-established system | Synonyms: institutionalised |
| institutionally | (adverb) by an institution | - |
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| intellectual | (adjective) appealing to or using the intellect | - |
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| (adjective) involving intelligence rather than emotions or instinct | Synonyms: cerebral |
| (adjective) of or associated with or requiring the use of the mind | Synonyms: noetic, rational |
| (noun) a person who uses the mind creatively | Synonyms: intellect |
| intellectualisation | (noun) (psychiatry) a defense mechanism that uses reasoning to block out emotional stress and conflict | Synonyms: intellectualization |
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| intellectualization | (noun) (psychiatry) a defense mechanism that uses reasoning to block out emotional stress and conflict | Synonyms: intellectualisation |
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| intellectually | (adverb) of or relating to the intellect | - |
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| intermixture | (noun) the act of mixing together | Synonyms: admixture, commixture, mix, mixing, mixture |
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| (noun) an additional ingredient that is added by mixing with the base | Synonyms: admixture |
| (noun) any foodstuff made by combining different ingredients | Synonyms: concoction, mixture |
| introitus | (noun) entrance or opening to a hollow organ or tube (especially the vaginal opening) | - |
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| intubate | (verb) introduce a cannula or tube into | Synonyms: cannulate, cannulise, cannulize, canulate |
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| intubation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulisation, cannulization, canulation, canulisation, canulization |
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| intuit | (verb) know or grasp by intuition or feeling | - |
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| intuition | (noun) instinctive knowing (without the use of rational processes) | - |
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| (noun) an impression that something might be the case | Synonyms: hunch, suspicion |
| intuitionism | (noun) (philosophy) the doctrine that knowledge is acquired primarily by intuition | - |
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| intuitionist | (adjective) of or relating to intuitionism | - |
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| intuitive | (adjective) obtained through intuition rather than from reasoning or observation | Synonyms: nonrational, visceral |
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| (adjective) spontaneously derived from or prompted by a natural tendency | - |
| intuitively | (adverb) in an intuitive manner | - |
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| intumesce | (verb) expand abnormally | Synonyms: swell, swell up, tumefy, tumesce |
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| (verb) move upwards in bubbles, as from the effect of heating; also used metaphorically | Synonyms: bubble up |
| 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 |
| intumescency | (noun) the increase in volume of certain substances when they are heated (often accompanied by release of water) | Synonyms: intumescence, swelling |
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| (noun) swelling up with blood or other fluids (as with congestion) | Synonyms: intumescence |
| intumescent | (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, puffy, swollen, tumescent, tumid, turgid |
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| intussuscept | (verb) introvert or invaginate | - |
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| intussusception | (noun) (biology) growth in the surface area of a cell by the deposit of new particles between existing particles in the cell wall | - |
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| (noun) the folding in of an outer layer so as to form a pocket in the surface | Synonyms: infolding, introversion, invagination |
| investiture | (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: investment |
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| (noun) the ceremony of installing a new monarch | Synonyms: coronation, enthronement, enthronisation, enthronization |
| jointure | (noun) the act of making or becoming a single unit | Synonyms: conjugation, unification, union, uniting |
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| (noun) (law) an estate secured to a prospective wife as a marriage settlement in lieu of a dower | Synonyms: legal jointure |
| judicature | (noun) the act of meting out justice according to the law | Synonyms: administration |
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| (noun) the position of judge | Synonyms: judgeship |
| (noun) the system of law courts that administer justice and constitute the judicial branch of government | Synonyms: judicatory, judicial system, judiciary |
| (noun) an assembly (including one or more judges) to conduct judicial business | Synonyms: court, tribunal |
| juncture | (noun) an event that occurs at a critical time | Synonyms: occasion |
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| (noun) the shape or manner in which things come together and a connection is made | Synonyms: articulation, join, joint, junction |
| (noun) a crisis situation or point in time when a critical decision must be made | Synonyms: critical point, crossroads |
| kittul | (noun) fishtail palm of India to Malay Peninsula; sap yields a brown sugar (jaggery) and trunk pith yields sago | Synonyms: Caryota urens, jaggery palm, kitul, kitul tree, toddy palm, wine palm |
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| kitul | (noun) fishtail palm of India to Malay Peninsula; sap yields a brown sugar (jaggery) and trunk pith yields sago | Synonyms: Caryota urens, jaggery palm, kittul, kitul tree, toddy palm, wine palm |
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| lassitude | (noun) weakness characterized by a lack of vitality or energy | Synonyms: inanition, lethargy, slackness |
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| (noun) a feeling of lack of interest or energy | Synonyms: languor, listlessness |
| (noun) a state of comatose torpor (as found in sleeping sickness) | Synonyms: lethargy, sluggishness |
| latitude | (noun) scope for freedom of e.g. action or thought; freedom from restriction | - |
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| (noun) the angular distance between an imaginary line around a heavenly body parallel to its equator and the equator itself | - |
| (noun) an imaginary line around the Earth parallel to the equator | Synonyms: line of latitude, parallel, parallel of latitude |
| (noun) freedom from normal restraints in conduct | - |
| latitudinal | (adjective) of or relating to latitudes north or south | - |
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| latitudinarian | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, undogmatic, undogmatical |
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| (noun) a person who is broad-minded and tolerant (especially in standards of religious belief and conduct) | - |
| lecture | (noun) teaching by giving a discourse on some subject (typically to a class) | Synonyms: lecturing |
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| (noun) a speech that is open to the public | Synonyms: public lecture, talk |
| (noun) a lengthy rebuke | Synonyms: speech, talking to |
| (verb) censure severely or angrily | Synonyms: bawl out, berate, call down, call on the carpet, chew out, chew up, chide, dress down, have words, jaw, lambast, lambaste, rag, rebuke, remonstrate, reprimand, scold, take to task, trounce |
| (verb) deliver a lecture or talk | Synonyms: talk |
| lecturer | (noun) someone who lectures professionally | - |
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| (noun) a public lecturer at certain universities | Synonyms: lector, reader |
| lectureship | (noun) the post of lecturer | - |
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| lecturing | (noun) teaching by giving a discourse on some subject (typically to a class) | Synonyms: lecture |
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| legislature | (noun) persons who make or amend or repeal laws | Synonyms: general assembly, law-makers, legislative assembly, legislative body |
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| 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 |
| letup | (noun) a pause during which things are calm or activities are diminished | Synonyms: lull |
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| ligature | (noun) the act of tying or binding things together | Synonyms: tying |
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| (noun) something used to tie or bind | Synonyms: binder |
| (noun) thread used by surgeons to bind a vessel (as to constrict the flow of blood) | - |
| (noun) a metal band used to attach a reed to the mouthpiece of a clarinet or saxophone | - |
| (noun) (music) a group of notes connected by a slur | - |
| (noun) character consisting of two or more letters combined into one | - |
| lilyturf | (noun) Asiatic perennial tufted herb with grasslike evergreen foliage and clusters of dark mauve grapelike flowers; grown as ground cover | Synonyms: lily turf, Liriope muscari |
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| literature | (noun) the profession or art of a writer | - |
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| (noun) the humanistic study of a body of literature | Synonyms: lit |
| (noun) creative writing of recognized artistic value | - |
| (noun) published writings in a particular style on a particular subject | - |
| liturgical | (adjective) of or relating to or in accord with liturgy | - |
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| liturgics | (noun) the study of liturgies | Synonyms: liturgiology |
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| liturgiology | (noun) the study of liturgies | Synonyms: liturgics |
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| liturgist | (noun) an authority on liturgies | - |
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| liturgy | (noun) a rite or body of rites prescribed for public worship | - |
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| longitude | (noun) the angular distance between a point on any meridian and the prime meridian at Greenwich | - |
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| longitudinal | (adjective) of or relating to lines of longitude | - |
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| (adjective) running lengthwise | - |
| (adjective) over an extended time | - |
| longitudinally | (adverb) with respect to longitude | - |
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| (adverb) in the direction of the length | Synonyms: lengthways, lengthwise, longways, longwise |
| (adverb) across time | - |
| lotus | (noun) white Egyptian lotus: water lily of Egypt to southeastern Africa; held sacred by the Egyptians | Synonyms: Egyptian water lily, Nymphaea lotus, white lily, white lotus |
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| (noun) native to eastern Asia; widely cultivated for its large pink or white flowers | Synonyms: Indian lotus, Nelumbo nucifera, sacred lotus |
| lotusland | (noun) an idyllic realm of contentment and self-indulgence | Synonyms: lotus land |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| magistrature | (noun) the position of magistrate | Synonyms: magistracy |
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| magnitude | (noun) the property of relative size or extent (whether large or small) | - |
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| (noun) relative importance | - |
| (noun) a number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10 | Synonyms: order of magnitude |
| mantua | (noun) loose gown of the 17th and 18th centuries | - |
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| manufacture | (noun) the organized action of making of goods and services for sale | Synonyms: industry |
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| (noun) the act of making something (a product) from raw materials | Synonyms: fabrication, manufacturing |
| (verb) put together out of artificial or natural components or parts | Synonyms: construct, fabricate |
| (verb) concoct something artificial or untrue | Synonyms: cook up, fabricate, invent, make up |
| (verb) create or produce in a mechanical way | - |
| (verb) produce naturally | - |
| manufactured | (adjective) produced in a large-scale industrial operation | - |
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| manufacturer | (noun) a business engaged in manufacturing some product | Synonyms: maker, manufacturing business |
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| (noun) someone who manufactures something | Synonyms: producer |
| manufacturing | (noun) the act of making something (a product) from raw materials | Synonyms: fabrication, manufacture |
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| masturbate | (verb) get sexual gratification through self-stimulation | Synonyms: fuck off, jack off, jerk off, she-bop, wank |
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| (verb) stimulate sexually | - |