| avifauna | (noun) the birds of a particular region or period | - |
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| buna | (noun) made by polymerizing butadiene | Synonyms: buna rubber |
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| communalism | (noun) the practice of communal living and common ownership | - |
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| (noun) loyalty and commitment to the interests of your own minority or ethnic group rather than to society as a whole | - |
| fauna | (noun) a living organism characterized by voluntary movement | Synonyms: animal, animate being, beast, brute, creature |
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| (noun) all the animal life in a particular region or period | Synonyms: zoology |
| funambulism | (noun) walking on a tightrope or slack rope | Synonyms: tightrope walking |
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| funambulist | (noun) an acrobat who performs on a tightrope or slack rope | Synonyms: tightrope walker |
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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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| koruna | (noun) the basic unit of money in Czech Republic | - |
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| (noun) the basic unit of money in Slovakia | - |
| lacuna | (noun) a blank gap or missing part | Synonyms: blank |
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| lacunar | (noun) an ornamental sunken panel in a ceiling or dome | Synonyms: caisson, coffer |
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| laguna | (noun) a body of water cut off from a larger body by a reef of sand or coral | Synonyms: lagoon, lagune |
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| lunacy | (noun) foolish or senseless behavior | Synonyms: craziness, folly, foolery, indulgence, tomfoolery |
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| (noun) obsolete terms for legal insanity | Synonyms: insaneness, madness |
| lunatic | (noun) an insane person | Synonyms: maniac |
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| (noun) a reckless impetuous irresponsible person | Synonyms: daredevil, harum-scarum, hothead, madcap, swashbuckler |
| lunation | (noun) the period between successive new moons (29.531 days) | Synonyms: lunar month, moon, synodic month |
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| mucuna | (noun) any of several erect or climbing woody plants of the genus Mucuna; widespread in tropics of both hemispheres | - |
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| nuna | (noun) used by males to address an older female | Synonyms: noona |
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| runabout | (noun) an open automobile having a front seat and a rumble seat | Synonyms: roadster, two-seater |
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| runaway | (noun) an easy victory | Synonyms: blowout, laugher, romp, shoo-in, walkaway |
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| (noun) someone who flees from an uncongenial situation | Synonyms: fleer, fugitive |
| sauna | (noun) a Finnish steam bath; steam is produced by pouring water over heated rocks | Synonyms: sweat room |
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| shogunate | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, authoritarianism, Caesarism, despotism, dictatorship, monocracy, one-man rule, Stalinism, totalitarianism, tyranny |
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| tribunal | (noun) an assembly (including one or more judges) to conduct judicial business | Synonyms: court, judicature |
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| tsunami | (noun) a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption | - |
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| tuna | (noun) any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters | Synonyms: tunny |
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| (noun) New Zealand eel | Synonyms: Anguilla sucklandii |
| (noun) important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks | Synonyms: tuna fish, tunny |
| (noun) tropical American prickly pear of Jamaica | Synonyms: Opuntia tuna |
| tunaburger | (noun) a sandwich that resembles a hamburger but made with tuna instead of beef | - |
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| unabridged | (noun) a dictionary that has not been shortened by the omitting terms or definitions; a comprehensive dictionary | Synonyms: unabridged dictionary |
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| unacceptability | (noun) unsatisfactoriness by virtue of not conforming to approved standards | Synonyms: unacceptableness |
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| unacceptableness | (noun) unsatisfactoriness by virtue of not conforming to approved standards | Synonyms: unacceptability |
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| unadaptability | (noun) the inability to change or be changed to fit changed circumstances | - |
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| unaffectedness | (noun) not affected; a personal manner that is not consciously constrained | - |
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| unai | (noun) relatively small fast-moving sloth with two long claws on each front foot | Synonyms: Choloepus didactylus, two-toed sloth, unau |
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| (noun) a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot | Synonyms: Choloepus hoffmanni, two-toed sloth, unau |
| unalterability | (noun) the quality of not being alterable | - |
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| (noun) the quality of being fixed and unchangeable | Synonyms: fixedness |
| unambiguity | (noun) clarity achieved by the avoidance of ambiguity | Synonyms: unequivocalness |
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| unanimity | (noun) everyone being of one mind | - |
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| unappetisingness | (noun) the property of spoiling the appetite | Synonyms: unappetizingness |
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| unappetizingness | (noun) the property of spoiling the appetite | Synonyms: unappetisingness |
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| unapproachability | (noun) a disposition to be unapproachable; unfriendly and inaccessible | - |
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| unary | (noun) the bijective base-1 numeral system: in order to represent a number N, an arbitrarily chosen symbol representing 1 is repeated N times. | Synonyms: unary numeral system |
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| unassertiveness | (noun) diffidence about self promotion | - |
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| unassumingness | (noun) a quality of naturalness and simplicity | Synonyms: sincerity |
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| unattainability | (noun) The fact of being unattainable, of not being able to be reached or acquired. | - |
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| unattainableness | (noun) the state of being unattainable | - |
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| unattractiveness | (noun) an ugliness of appearance that is not appealing to viewers | - |
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| unau | (noun) relatively small fast-moving sloth with two long claws on each front foot | Synonyms: Choloepus didactylus, two-toed sloth, unai |
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| (noun) a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot | Synonyms: Choloepus hoffmanni, two-toed sloth, unai |
| unavailability | (noun) the quality of not being available when needed | - |
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| unavoidability | (noun) the quality of being impossible to avoid or evade | Synonyms: ineluctability |
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| unawareness | (noun) unconsciousness resulting from lack of knowledge or attention | Synonyms: unknowingness |
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| unfortunate | (noun) a person who suffers misfortune | Synonyms: unfortunate person |
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| vicuna | (noun) small wild cud-chewing Andean animal similar to the guanaco but smaller; valued for its fleecy undercoat | Synonyms: Vicugna vicugna |
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| (noun) a soft wool fabric made from the fleece of the vicuna | - |
| (noun) the wool of the vicuna | - |