| imperturbableness | (noun) calm and unruffled self-assurance | Synonyms: coolness, imperturbability |
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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 |
| inadvertency | (noun) the trait of forgetting or ignoring your responsibilities | Synonyms: heedlessness, inadvertence, unmindfulness |
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| incertitude | (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, uncertainty |
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| incontrovertibility | (noun) the quality of being undeniable and not worth arguing about | Synonyms: incontrovertibleness, positiveness, positivity |
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| incontrovertibleness | (noun) the quality of being undeniable and not worth arguing about | Synonyms: incontrovertibility, positiveness, positivity |
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| inconvertibility | (noun) the quality of not being exchangeable | - |
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| inertia | (noun) a disposition to remain inactive or inert | Synonyms: inactiveness, inactivity |
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| (noun) (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force | - |
| inertness | (noun) immobility by virtue of being inert | - |
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| infertility | (noun) the state of being unable to produce offspring; in a woman it is an inability to conceive; in a man it is an inability to impregnate | Synonyms: sterility |
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| insert | (noun) (film) a still picture that is introduced and that interrupts the action of a film | Synonyms: cut-in |
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| (noun) (broadcasting) a local announcement inserted into a network program | Synonyms: cut-in |
| (noun) an artifact that is inserted or is to be inserted | Synonyms: inset |
| (noun) a folded section placed between the leaves of another publication | - |
| insertion | (noun) the act of putting one thing into another | Synonyms: introduction, intromission |
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| (noun) a message (spoken or written) that is introduced or inserted | Synonyms: interpolation |
| intertrigo | (noun) chafing between two skin surfaces that are in contact (as in the armpit or under the breasts or between the thighs) | - |
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| introvert | (noun) (psychology) a person who tends to shrink from social contacts and to become preoccupied with their own thoughts | - |
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| invertase | (noun) an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose | Synonyms: saccharase, sucrase |
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| invertebrate | (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification | - |
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| inverter | (noun) an electrical converter that converts direct current into alternating current | - |
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| kilohertz | (noun) one thousand periods per second | Synonyms: kc, kHz, kilocycle, kilocycle per second |
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| lacertid | (noun) Old World terrestrial lizard | Synonyms: lacertid lizard |
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| lambert | (noun) a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter | Synonyms: L |
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| libertarian | (noun) someone who believes the doctrine of free will | - |
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| (noun) an advocate of libertarianism | - |
| libertarianism | (noun) an ideological belief in freedom of thought, speech and action | - |
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| libertine | (noun) a dissolute person; usually a man who is morally unrestrained | Synonyms: debauchee, rounder |
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| libertinism | (noun) A lifestyle or pattern of behavior characterized by self-indulgence and lack of restraint, especially one involving sexual promiscuity and rejection of religious or other moral authority. | - |
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| liberty | (noun) an act of undue intimacy | Synonyms: familiarity, impropriety, indecorum |
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| (noun) immunity from arbitrary exercise of authority: political independence | Synonyms: autonomy |
| (noun) freedom of choice | - |
| (noun) personal freedom from servitude or confinement or oppression | - |
| (noun) leave granted to a sailor or naval officer | Synonyms: shore leave |
| megahertz | (noun) one million periods per second | Synonyms: Mc, megacycle, megacycle per second, MHz |
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| nemertean | (noun) soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract | Synonyms: nemertine, proboscis worm, ribbon worm |
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| nemertine | (noun) soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract | Synonyms: nemertean, proboscis worm, ribbon worm |
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| offertory | (noun) the offerings of the congregation at a religious service | - |
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| omerta | (noun) a code of silence practiced by the Mafia; a refusal to give evidence to the police about criminal activities | - |
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| overexertion | (noun) excessive exertion; so much exertion that discomfort or injury results | - |
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| overtaking | (noun) going by something that is moving in order to get in front of it | Synonyms: passing |
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| overthrow | (noun) the termination of a ruler or institution (especially by force) | - |
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| (noun) the act of disturbing the mind or body | Synonyms: derangement, upset |
| overtime | (noun) playing time beyond regulation, to break a tie | Synonyms: extra time |
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| (noun) work done in addition to regular working hours | - |
| overtolerance | (noun) too much permissiveness | - |
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| overtone | (noun) a harmonic with a frequency that is a multiple of the fundamental frequency | Synonyms: partial, partial tone |
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| (noun) (usually plural) an ulterior implicit meaning or quality | - |
| overture | (noun) a tentative suggestion designed to elicit the reactions of others | Synonyms: advance, approach, feeler |
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| (noun) orchestral music played at the beginning of an opera or oratorio | - |
| (noun) something that serves as a preceding event or introduces what follows | Synonyms: preliminary, prelude |
| overturn | (noun) the act of upsetting something | Synonyms: turnover, upset |
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| (noun) an improbable and unexpected victory | Synonyms: upset |
| pertainym | (noun) meaning relating to or pertaining to | - |
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| pertinacity | (noun) persistent determination | Synonyms: doggedness, perseverance, persistence, persistency, tenaciousness, tenacity |
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| pertinence | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: applicability, pertinency |
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| pertinency | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: applicability, pertinence |
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| pertness | (noun) inappropriate playfulness | Synonyms: archness, impertinence, perkiness, sauciness |
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| (noun) quality of being lively and confident | - |
| perturbation | (noun) the act of causing disorder | Synonyms: disruption |
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| (noun) a disposition that is confused or nervous and upset | Synonyms: fluster |
| (noun) activity that is a malfunction, intrusion, or interruption | Synonyms: disturbance |
| (noun) (physics) a secondary influence on a system that causes it to deviate slightly | - |
| (noun) an unhappy and worried mental state | Synonyms: disturbance, upset |
| pertussis | (noun) a disease of the respiratory mucous membrane | Synonyms: whooping cough |
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| pervert | (noun) a person whose behavior deviates from what is acceptable especially in sexual behavior | Synonyms: degenerate, deviant, deviate, perv, perve |
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| poverty | (noun) the state of having little or no money and few or no material possessions | Synonyms: impoverishment, poorness |
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| prepuberty | (noun) a period of two years immediately prior to the onset of puberty when growth and changes leading to sexual maturity occur | - |
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| proconvertin | (noun) a coagulation factor formed in the kidney under the influence of vitamin K | Synonyms: cothromboplastin, factor VII, stable factor |
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| property | (noun) any movable articles or objects used on the set of a play or movie | Synonyms: prop |
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| (noun) a basic or essential property shared by all members of a class | - |
| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: attribute, dimension |
| (noun) any area set aside for a particular purpose | Synonyms: place |
| (noun) something owned; any tangible or intangible possession that is owned by someone | Synonyms: belongings, holding |
| puberty | (noun) the time of life when sex glands become functional | Synonyms: pubescence |
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| reassertion | (noun) renewed affirmation | Synonyms: reaffirmation |
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| repertoire | (noun) a collection of works (plays, songs, operas, ballets) that an artist or company can perform and do perform for short intervals on a regular schedule | Synonyms: repertory |
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| (noun) the entire range of skills or aptitudes or devices used in a particular field or occupation | Synonyms: repertory |
| repertory | (noun) a storehouse where a stock of things is kept | - |
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| (noun) the entire range of skills or aptitudes or devices used in a particular field or occupation | Synonyms: repertoire |
| (noun) a collection of works (plays, songs, operas, ballets) that an artist or company can perform and do perform for short intervals on a regular schedule | Synonyms: repertoire |
| (noun) a theatrical company that performs plays from a repertoire | Synonyms: repertory company, stock company |
| reverting | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, lapsing, relapse, relapsing, reversion |
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| sabertooth | (noun) any of many extinct cats of the Old and New Worlds having long swordlike upper canine teeth; from the Oligocene through the Pleistocene | Synonyms: saber-toothed tiger |
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| semidesert | (noun) a region much like a desert but usually located between a desert and the surrounding regions | - |
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| sertindole | (noun) an antipsychotic medication used in the treatment of schizophrenia. | - |
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| sertraline | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade name Zoloft) | Synonyms: Zoloft |
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| sertularian | (noun) feathery colony of long-branched stems bearing stalkless paired polyps | - |
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| sherbert | (noun) a frozen dessert made primarily of fruit juice and sugar, but also containing milk or egg-white or gelatin | Synonyms: sherbet |
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| silvertip | (noun) powerful brownish-yellow bear of the uplands of western North America | Synonyms: grizzly, grizzly bear, silver-tip, Ursus arctos horribilis, Ursus horribilis |
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| stertor | (noun) the act of snoring or producing a snoring sound | Synonyms: snore, snoring |
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| subverter | (noun) a radical supporter of political or social revolution | Synonyms: revolutionary, revolutionist, subversive |
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| summertime | (noun) the warmest season of the year; in the Northern Hemisphere it extends from the summer solstice to the autumnal equinox | Synonyms: summer |
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| supertanker | (noun) the largest class of oil tankers | - |
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| supertax | (noun) an additional tax on certain kinds of income that has already been taxed | Synonyms: surtax |
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| supertitle | (noun) translation of the words of a foreign opera (or choral work) projected on a screen above the stage | Synonyms: surtitle |
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| supertonic | (noun) (music) the second note of a diatonic scale | - |
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| supertwister | (noun) the most powerful tornado which can create enormously devastating damage | - |
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| suppertime | (noun) the customary or habitual hour for the evening meal | Synonyms: dinnertime |
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| teetertotter | (noun) a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end | Synonyms: dandle board, seesaw, teeter-totter, teeter, teeterboard, tilting board |
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| terahertz | (noun) one trillion periods per second | Synonyms: THz |
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| tertigravida | (noun) a woman who is pregnant for the third time | Synonyms: gravida III |
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| unassertiveness | (noun) diffidence about self promotion | - |
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| uncertainness | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainty |
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| uncertainty | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainness |
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| (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, incertitude |
| undertaker | (noun) one whose business is the management of funerals | Synonyms: funeral director, funeral undertaker, mortician |
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| undertaking | (noun) any piece of work that is undertaken or attempted | Synonyms: labor, labour, project, task |
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| (noun) the trade of a funeral director | - |
| undertide | (noun) a current below the surface of a fluid | Synonyms: undercurrent |
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| undertone | (noun) a pale or subdued color | Synonyms: tinge |
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| (noun) a subdued emotional quality underlying an utterance; implicit meaning | Synonyms: undercurrent |
| (noun) a quiet or hushed tone of voice | - |
| undertow | (noun) the seaward undercurrent created after waves have broken on the shore | Synonyms: sea-poose, sea-purse, sea-puss, sea purse, sea puss |
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| (noun) an inclination contrary to the strongest or prevailing feeling | - |
| vertebra | (noun) one of the bony segments of the spinal column | - |
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| vertebrate | (noun) animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium | Synonyms: craniate |
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| vertex | (noun) the point of intersection of lines or the point opposite the base of a figure | - |
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| (noun) the highest point (of something) | Synonyms: acme, apex, peak |
| vertical | (noun) a vertical structural member as a post or stake | Synonyms: upright |
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| (noun) something that is oriented vertically | - |
| verticality | (noun) position at right angles to the horizon | Synonyms: erectness, uprightness, verticalness |
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| verticalness | (noun) position at right angles to the horizon | Synonyms: erectness, uprightness, verticality |
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| verticil | (noun) a whorl of leaves growing around a stem | - |
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| verticilliosis | (noun) wilt caused by fungi of the genus Verticillium | - |
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| verticillium | (noun) a fungus of the genus Verticillium | - |
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| vertigo | (noun) a reeling sensation; a feeling that you are about to fall | Synonyms: dizziness, giddiness, lightheadedness |
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| vertu | (noun) artistic quality | Synonyms: virtu |
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| (noun) love of or taste for fine objects of art | Synonyms: connoisseurship, virtu |
| vespertilionid | (noun) a variety of carnivorous bat | Synonyms: vespertilian bat |
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| watertightness | (noun) The condition of being so tightly made that water cannot enter or escape. | Synonyms: waterproofness |
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| watertube | (noun) a boiler tube through which the water flows. | Synonyms: water tube |
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| wintertime | (noun) the coldest season of the year; in the Northern Hemisphere it extends from the winter solstice to the vernal equinox | Synonyms: winter |
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