| holibut | (noun) marine food fish of the northern Atlantic or northern Pacific; the largest flatfish and one of the largest teleost fishes | Synonyms: halibut |
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| ibex | (noun) wild goat of mountain areas of Eurasia and northern Africa having large recurved horns | Synonyms: Capra ibex |
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| ibis | (noun) wading birds of warm regions having long slender down-curved bills | - |
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| ibuprofen | (noun) a nonsteroidal anti-inflammatory and analgesic medicine (trade names Advil and Motrin and Nuprin) used to relieve the pain of arthritis and as an antipyretic | Synonyms: Advil, isobutylphenyl propionic acid, Motrin, Nuprin |
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| illegibility | (noun) the quality of writing (print or handwriting) that cannot be deciphered | - |
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| illiberality | (noun) a disposition not to be liberal (generous) with money | - |
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| imbiber | (noun) a person who drinks alcoholic beverages (especially to excess) | Synonyms: drinker, juicer, toper |
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| imbibing | (noun) the act of consuming liquids | Synonyms: drinking, imbibition |
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| imbibition | (noun) the act of consuming liquids | Synonyms: drinking, imbibing |
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| (noun) (chemistry) the absorption of a liquid by a solid or gel | - |
| imperceptibility | (noun) the property of being imperceptible by the mind or the senses | - |
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| imperfectibility | (noun) the capability of becoming imperfect | - |
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| impermissibility | (noun) inadmissibility as a consequence of not being permitted | - |
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| implausibility | (noun) the quality of provoking disbelief | Synonyms: implausibleness |
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| implausibleness | (noun) the quality of provoking disbelief | Synonyms: implausibility |
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| impossibility | (noun) an alternative that is not available | Synonyms: impossible action |
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| (noun) incapability of existing or occurring | Synonyms: impossibleness |
| impossible | (noun) something that cannot be done | - |
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| impossibleness | (noun) incapability of existing or occurring | Synonyms: impossibility |
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| inaccessibility | (noun) the quality of not being accessible | - |
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| inadmissibility | (noun) unacceptability as a consequence of not being admissible | - |
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| inaudibility | (noun) the quality of not being perceptible by the ear | Synonyms: inaudibleness |
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| inaudibleness | (noun) the quality of not being perceptible by the ear | Synonyms: inaudibility |
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| incompatibility | (noun) the quality of being unable to exist or work in congenial combination | - |
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| (noun) the relation between propositions that cannot both be true at the same time | Synonyms: inconsistency, mutual exclusiveness, repugnance |
| (noun) (immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue) | - |
| incomprehensibility | (noun) the quality of being incomprehensible | - |
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| incompressibility | (noun) the property of being incompressible | - |
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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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| incorruptibility | (noun) the incapability of being corrupted | - |
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| incredibility | (noun) the quality of being incredible | Synonyms: incredibleness |
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| incredibleness | (noun) the quality of being incredible | Synonyms: incredibility |
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| indelibility | (noun) The quality of being difficult to delete, remove, wash away, blot out, or efface. | Synonyms: ineffaceability |
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| indescribability | (noun) The quality or state of being impossible, or very difficult to describe. | Synonyms: indescribableness |
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| indescribableness | (noun) The quality or state of being impossible, or very difficult to describe. | Synonyms: indescribability |
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| indestructibility | (noun) the strength to resist destruction | - |
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| indigestibility | (noun) the property of being difficult to digest | Synonyms: indigestibleness |
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| indigestibleness | (noun) the property of being difficult to digest | Synonyms: indigestibility |
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| indiscernibility | (noun) The state or characteristic of being indiscernible; inability to be observed. | - |
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| indivisibility | (noun) (arithmetic) The state of being impossible to divide by a specific integer without leaving a remainder. | - |
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| ineligibility | (noun) the quality or state of being ineligible | - |
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| inexhaustibility | (noun) The state or condition of being impossible to exhaust; of being unlimited. | - |
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| infallibility | (noun) the quality of never making an error | - |
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| infeasibility | (noun) the quality of not being doable | Synonyms: unfeasibility |
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| inflexibility | (noun) the quality of being rigid and rigorously severe | Synonyms: rigidity, rigidness |
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| (noun) a lack of physical flexibility | Synonyms: inflexibleness |
| inflexibleness | (noun) a lack of physical flexibility | Synonyms: inflexibility |
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| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| inhibition | (noun) (psychology) the conscious exclusion of unacceptable thoughts or desires | Synonyms: suppression |
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| (noun) the action of prohibiting or inhibiting or forbidding (or an instance thereof) | Synonyms: forbiddance, prohibition |
| (noun) the quality of being inhibited | - |
| (noun) (physiology) the process whereby nerves can retard or prevent the functioning of an organ or part | - |
| inhibitor | (noun) a substance that retards or stops an activity | - |
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| insensibility | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, callousness, hardness, unfeelingness |
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| (noun) a lack of sensibility | - |
| intangibility | (noun) the quality of being intangible and not perceptible by touch | Synonyms: impalpability, intangibleness |
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| intangible | (noun) assets that are saleable though not material or physical | Synonyms: intangible asset |
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| intangibleness | (noun) the quality of being intangible and not perceptible by touch | Synonyms: impalpability, intangibility |
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| intelligibility | (noun) the quality of language that is comprehensible | - |
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| invincibility | (noun) the property being difficult or impossible to defeat | Synonyms: indomitability |
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| invisibility | (noun) the quality of not being perceivable by the eye | Synonyms: invisibleness |
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| invisibleness | (noun) the quality of not being perceivable by the eye | Synonyms: invisibility |
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| irascibility | (noun) a feeling of resentful anger | Synonyms: quick temper, short temper, spleen |
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| irrepressibility | (noun) irrepressible liveliness and good spirit | Synonyms: buoyancy |
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| irreproducibility | (noun) the quality of being unreproducible | - |
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| irresistibility | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibleness |
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| irresistibleness | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibility |
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| irresponsibility | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibleness |
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| irresponsibleness | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibility |
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| irreversibility | (noun) the quality of being irreversible (once done it cannot be changed) | - |
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| isoantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: alloantibody |
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| jib | (noun) any triangular fore-and-aft sail (set forward of the foremast) | - |
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| jibboom | (noun) a spar that extends the bowsprit | - |
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| jibe | (noun) an aggressive remark directed at a person like a missile and intended to have a telling effect | Synonyms: barb, dig, gibe, shaft, shot, slam |
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| kibble | (noun) an iron bucket used for hoisting in wells or mining | - |
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| (noun) coarsely ground grain in the form of pellets (as for pet food) | - |
| kibbutz | (noun) a collective farm or settlement owned by its members in modern Israel; children are reared collectively | - |
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| kibbutznik | (noun) a member of a kibbutz | - |
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| kibe | (noun) ulcerated chilblain on the heel | - |
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| kibibit | (noun) a unit of information equal to 1024 bits | Synonyms: kibit |
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| kibibyte | (noun) a unit of information equal to 1024 bytes | Synonyms: K, kB, KB, KiB, kilobyte |
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| kibit | (noun) a unit of information equal to 1024 bits | Synonyms: kibibit |
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| kibitzer | (noun) (Yiddish) a meddler who offers unwanted advice to others | - |
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| lamellibranch | (noun) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together | Synonyms: bivalve, pelecypod |
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| legibility | (noun) a quality of writing (print or handwriting) that can be easily read | Synonyms: readability |
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| (noun) distinctness that makes perception easy | Synonyms: discernability |
| libation | (noun) the act of pouring a liquid offering (especially wine) as a religious ceremony | - |
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| (noun) a serving (of wine) poured out in honor of a deity | - |
| (noun) (facetious) a serving of an alcoholic beverage | - |
| libber | (noun) a supporter of feminism | Synonyms: feminist, women's liberationist, women's rightist |
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| libel | (noun) a false and malicious publication printed for the purpose of defaming a living person | - |
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| (noun) the written statement of a plaintiff explaining the cause of action (the defamation) and any relief he seeks | - |
| libeler | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, maligner, slanderer, traducer, vilifier |
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| liberal | (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberalist, progressive |
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| (noun) a person who favors an economic theory of laissez-faire and self-regulating markets | - |
| liberalisation | (noun) the act of making less strict | Synonyms: liberalization, relaxation |
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| liberalism | (noun) a political orientation that favors social progress by reform and by changing laws rather than by revolution | - |
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| (noun) an economic theory advocating free competition and a self-regulating market | - |
| liberalist | (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberal, progressive |
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| liberality | (noun) the trait of being generous in behavior and temperament | Synonyms: liberalness |
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| (noun) an inclination to favor progress and individual freedom | Synonyms: liberalness |
| liberalization | (noun) the act of making less strict | Synonyms: liberalisation, relaxation |
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| liberalness | (noun) the trait of being generous in behavior and temperament | Synonyms: liberality |
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| (noun) an inclination to favor progress and individual freedom | Synonyms: liberality |
| liberation | (noun) the attempt to achieve equal rights or status | - |
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| (noun) the termination of someone's employment (leaving them free to depart) | Synonyms: discharge, dismissal, dismission, firing, release, sack, sacking |
| (noun) the act of liberating someone or something | Synonyms: freeing, release |
| liberator | (noun) someone who releases people from captivity or bondage | - |
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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 |
| libido | (noun) (psychoanalysis) a Freudian term for sexual urge or desire | - |
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| librarian | (noun) a professional person trained in library science and engaged in library services | Synonyms: bibliothec |
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| librarianship | (noun) the position of librarian | - |
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| library | (noun) a depository built to contain books and other materials for reading and study | Synonyms: depository library |
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| (noun) a room where books are kept | - |
| (noun) a building that houses a collection of books and other materials | - |
| (noun) a collection of literary documents or records kept for reference or borrowing | - |
| (noun) (computing) a collection of standard programs and subroutines that are stored and available for immediate use | Synonyms: program library, subroutine library |
| libration | (noun) (astronomy) a real or apparent slow oscillation of a moon or satellite | - |
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