| invalidism | (noun) chronic ill health | - |
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| invalidity | (noun) illogicality as a consequence of having a conclusion that does not follow from the premisses | Synonyms: invalidness |
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| invalidness | (noun) illogicality as a consequence of having a conclusion that does not follow from the premisses | Synonyms: invalidity |
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| invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
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| invaluableness | (noun) the positive quality of being precious and beyond value | Synonyms: preciousness, pricelessness, valuableness |
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| invariability | (noun) the quality of being resistant to variation | Synonyms: invariableness, invariance |
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| (noun) a quality of uniformity and lack of variation | Synonyms: evenness |
| invariable | (adjective) not liable to or capable of change | - |
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| (noun) a quantity that does not vary | Synonyms: constant, constant quantity |
| invariableness | (noun) the quality of being resistant to variation | Synonyms: invariability, invariance |
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| invariably | (adverb) without variation or change, in every case | Synonyms: always, constantly |
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| 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 | - |
| 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 | - |
| invasion | (noun) the act of invading; the act of an army that invades for conquest or plunder | - |
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| (noun) any entry into an area not previously occupied | Synonyms: encroachment, intrusion |
| (noun) (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body | - |
| invasive | (adjective) marked by a tendency to spread especially into healthy tissue | - |
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| (adjective) relating to a technique in which the body is entered by puncture or incision | - |
| (adjective) gradually intrusive without right or permission | Synonyms: encroaching, trespassing |
| (adjective) involving invasion or aggressive attack | Synonyms: incursive, invading |
| invasiveness | (noun) The quality of involving entry into the living body (as by incision or by insertion of an instrument). | - |
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| (noun) The quality of tending to spread; especially of tending to invade healthy tissue. | - |
| irrelevance | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevancy |
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| irrelevancy | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevance |
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| irrelevant | (adjective) having no bearing on or connection with the subject at issue | - |
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| irrelevantly | (adverb) in an irrelevant manner | - |
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| irremovability | (noun) the quality or state of not being removable. | - |
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| irremovable | (adjective) incapable of being removed or away or dismiss | - |
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| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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| irretrievably | (adverb) in an irretrievable manner | - |
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| iva | (noun) any of various coarse shrubby plants of the genus Iva with small greenish flowers; common in moist areas (as coastal salt marshes) of eastern and central North America | Synonyms: marsh elder |
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| java | (noun) a beverage consisting of an infusion of ground coffee beans | Synonyms: coffee |
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| kava | (noun) an alcoholic drink made from the aromatic roots of the kava shrub | Synonyms: kavakava |
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| kavakava | (noun) an alcoholic drink made from the aromatic roots of the kava shrub | Synonyms: kava |
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| kuvasz | (noun) long-established Hungarian breed of tall light-footed but sturdy white dog; used also as a hunting dog | - |
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| kvass | (noun) fermented beverage resembling beer but made from rye or barley | - |
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| larva | (noun) the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose | - |
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| larvacean | (noun) any member of the class Larvacea | - |
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| larvacide | (noun) an insecticide that kills the larvae of insects | - |
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| larval | (adjective) relating to or typical of a larva | - |
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| (adjective) immature of its kind; especially being or characteristic of immature insects in the newly hatched wormlike feeding stage | - |
| lava | (noun) rock that in its molten form (as magma) issues from volcanoes; lava is what magma is called when it reaches the surface | - |
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| lavabo | (noun) a basin for washing the hands | Synonyms: handbasin, wash-hand basin, washbasin, washbowl |
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| lavage | (noun) washing out a hollow organ (especially the stomach) by flushing with water | - |
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| lavalava | (noun) a skirt consisting of a rectangle of calico or printed cotton; worn by Polynesians (especially Samoans) | - |
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| lavalier | (noun) jeweled pendant worn on a chain around the neck | Synonyms: lavaliere, lavalliere |
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| lavaliere | (noun) jeweled pendant worn on a chain around the neck | Synonyms: lavalier, lavalliere |
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| lavalliere | (noun) jeweled pendant worn on a chain around the neck | Synonyms: lavalier, lavaliere |
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| lavation | (noun) the work of cleansing (usually with soap and water) | Synonyms: wash, washing |
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| lavatory | (noun) a room or building equipped with one or more toilets | Synonyms: bathroom, can, john, lav, privy, toilet |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: basin, washbasin, washbowl, washstand |
| (noun) a toilet that is cleaned of waste by the flow of water through it | Synonyms: flush toilet |
| lekvar | (noun) a sweet filling made of prunes or apricots | - |
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| levallorphan | (noun) drug (trade name Lorfan) that is related to morphine but that counteracts the respiratory depression produced by morphine poisoning but without affecting its analgesic effects | Synonyms: Lorfan |
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| levant | (verb) run off without paying a debt | - |
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| levanter | (noun) an easterly wind in the western Mediterranean area | - |
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| levator | (noun) a muscle that serves to lift some body part (as the eyelid or lip) | - |
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| livable | (adjective) fit or suitable to live in or with | Synonyms: liveable |
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| louvar | (noun) large silvery fish found worldwide in warm seas but nowhere common; resembles a whale and feeds on plankton | Synonyms: Luvarus imperialis |
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| lovable | (adjective) having characteristics that attract love or affection | Synonyms: loveable |
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| lovage | (noun) stalks eaten like celery or candied like angelica; seeds used for flavoring or pickled like capers | - |
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| (noun) herb native to southern Europe; cultivated for its edible stalks and foliage and seeds | Synonyms: Levisticum officinale |
| lovastatin | (noun) an oral drug (trade name Mevacor) to reduce blood cholesterol levels; used when dietary changes have proved inadequate | Synonyms: Mevacor |
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| maidservant | (noun) a female domestic | Synonyms: amah, housemaid, maid |
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| malvasia | (noun) grape used to make malmsey wine | - |
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| manservant | (noun) a man servant | - |
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| masdevallia | (noun) any of numerous orchids of the genus Masdevallia; tufted evergreen often diminutive plants whose flowers in a remarkable range of colors usually resemble a tricorn with sepals fused at the base to form a tube | - |
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| medevac | (noun) the evacuation of persons (usually by air transportation) to a place where they can receive medical care | Synonyms: medical evacuation, medivac |
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| mediaeval | (adjective) relating to or belonging to the Middle Ages | Synonyms: medieval |
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| (adjective) as if belonging to the Middle Ages; old-fashioned and unenlightened | Synonyms: gothic, medieval |
| (adjective) characteristic of the time of chivalry and knighthood in the Middle Ages | Synonyms: chivalric, knightly, medieval |
| medieval | (adjective) relating to or belonging to the Middle Ages | Synonyms: mediaeval |
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| (adjective) as if belonging to the Middle Ages; old-fashioned and unenlightened | Synonyms: gothic, mediaeval |
| (adjective) characteristic of the time of chivalry and knighthood in the Middle Ages | Synonyms: chivalric, knightly, mediaeval |
| medievality | (noun) The quality of being of or relating to the Middle Ages, perhaps circa 500 to circa 1500 CE. | - |
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| medivac | (noun) the evacuation of persons (usually by air transportation) to a place where they can receive medical care | Synonyms: medevac, medical evacuation |
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| mikvah | (noun) (Hebrew) a ritual purification and cleansing bath that Orthodox Jews take on certain occasions (as before Sabbath or after menstruation) | - |
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| milliequivalent | (noun) one-thousandth of an equivalent | Synonyms: meq |
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| minivan | (noun) a small box-shaped passenger van; usually has removable seats; used as a family car | - |
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| mitsvah | (noun) (Judaism) a good deed performed out of religious duty | Synonyms: mitzvah |
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| (noun) (Judaism) a precept or commandment of the Jewish law | Synonyms: mitzvah |
| mitzvah | (noun) (Judaism) a good deed performed out of religious duty | Synonyms: mitsvah |
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| (noun) (Judaism) a precept or commandment of the Jewish law | Synonyms: mitsvah |
| monovalent | (adjective) having a valence of 1 | Synonyms: univalent |
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| (adjective) containing only one kind of antibody | - |
| motivate | (verb) give an incentive for action | Synonyms: actuate, incite, move, prompt, propel |
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| motivated | (adjective) provided with a motive or given incentive for action | - |
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| motivating | (adjective) impelling to action | Synonyms: motivative, motive |
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| (noun) the act of motivating; providing incentive | Synonyms: motivation |
| motivation | (noun) the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior | Synonyms: motive, need |
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| (noun) the act of motivating; providing incentive | Synonyms: motivating |
| (noun) the condition of being motivated | - |
| motivational | (adjective) of or relating to motivation | - |
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| motivative | (adjective) impelling to action | Synonyms: motivating, motive |
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| motivator | (noun) a positive motivational influence | Synonyms: incentive, inducement |
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| movability | (noun) the quality of being movable; capable of being moved or rearranged | Synonyms: movableness |
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| movable | (adjective) capable of being moved or conveyed from one place to another | Synonyms: moveable, transferable, transferrable, transportable |
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| (adjective) (of personal property as opposed to real estate) can be moved from place to place (especially carried by hand) | - |
| (noun) personal as opposed to real property; any tangible movable property (furniture or domestic animals or a car etc) | Synonyms: chattel, personal chattel |
| movableness | (noun) the quality of being movable; capable of being moved or rearranged | Synonyms: movability |
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| multivalence | (noun) (chemistry) the state of having a valence greater than two | Synonyms: multivalency, polyvalence, polyvalency |
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| multivalency | (noun) (chemistry) the state of having a valence greater than two | Synonyms: multivalence, polyvalence, polyvalency |
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| multivalent | (adjective) used of the association of three or more homologous chromosomes during the first division of meiosis | - |
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| (adjective) having more than one valence, or having a valence of 3 or higher | Synonyms: polyvalent |
| (adjective) having many values, meanings, or appeals | Synonyms: multi-valued |
| multivariate | (adjective) pertaining to any procedure involving two or more variables | - |
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| naval | (adjective) connected with or belonging to or used in a navy | - |
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| neoconservatism | (noun) an approach to politics or theology that represents a return to a traditional point of view (in contrast to more liberal or radical schools of thought of the 1960s) | - |
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| neoconservative | (noun) a conservative who subscribes to neoconservatism | Synonyms: neocon |
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| nirvana | (noun) any place of complete bliss and delight and peace | Synonyms: Eden, heaven, paradise, promised land, Shangri-la |
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| (noun) (Hinduism and Buddhism) the beatitude that transcends the cycle of reincarnation; characterized by the extinction of desire and suffering and individual consciousness | Synonyms: enlightenment |
| nonequivalence | (noun) not interchangeable | - |
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| nonequivalent | (adjective) not equal or interchangeable in value, quantity, or significance | - |
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| noninvasive | (adjective) relating to a technique that does not involve puncturing the skin or entering a body cavity | - |
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| noninvasiveness | (noun) The quality of not being or involving an invasive medical procedure. | - |
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| nonobservance | (noun) a lack of conformity with law or custom or practice etc. | - |
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| nonobservant | (adjective) failing or refusing to observe religious customs | - |
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| nova | (noun) a star that ejects some of its material in the form of a cloud and becomes more luminous in the process | - |
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| novate | (verb) replace with something new, especially an old obligation by a new one | - |
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| novation | (noun) (law) the replacement of one obligation by another by mutual agreement of both parties; usually the replacement of one of the original parties to a contract with the consent of the remaining party | - |
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| obovate | (adjective) (of a leaf shape) egg-shaped with the narrower end at the base | - |
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| observable | (adjective) capable of being seen or noticed | Synonyms: discernible, evident |
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| observably | (adverb) in a noticeable manner | Synonyms: noticeably, perceptibly |
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| observance | (noun) the act of observing; taking a patient look | Synonyms: observation, watching |
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| (noun) conformity with law or custom or practice etc. | Synonyms: honoring, honouring |
| (noun) the act of noticing or paying attention | Synonyms: notice, observation |
| (noun) a formal event performed on a special occasion | Synonyms: ceremonial, ceremonial occasion, ceremony |
| observant | (adjective) paying close attention especially to details | - |
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| (adjective) (of individuals) adhering strictly to laws and rules and customs | Synonyms: law-abiding |
| (adjective) quick to notice; showing quick and keen perception | Synonyms: observing |
| observantly | (adverb) in an observant manner | Synonyms: observingly |
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| observation | (noun) the act of observing; taking a patient look | Synonyms: observance, watching |
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| (noun) the act of making and recording a measurement | - |
| (noun) the act of noticing or paying attention | Synonyms: notice, observance |
| (noun) facts learned by observing | - |
| (noun) a remark expressing careful consideration | Synonyms: reflection, reflexion |