| informercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: infomercial |
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| inguinal | (adjective) of or relating to or near the groin | - |
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| inimical | (adjective) not friendly | Synonyms: unfriendly |
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| initial | (adjective) occurring at the beginning | - |
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| (noun) the first letter of a word (especially a person's name) | - |
| (verb) mark with one's initials | - |
| innovational | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: groundbreaking, innovative |
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| inquisitorial | (adjective) especially indicating a form of prosecution in which proceedings are secret and the accused is questioned by a prosecutor who acts also as the judge | - |
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| (adjective) having the authority to conduct official investigations | - |
| (adjective) marked by inquisitive interest; especially suggestive of an ecclesiastical inquisitor | - |
| insecticidal | (adjective) of or relating to insecticide | - |
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| inspirational | (adjective) imparting a divine influence on the mind and soul | - |
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| instal | (verb) set up for use | Synonyms: install, put in, set up |
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| (verb) place | Synonyms: establish, install, set up |
| (verb) put into an office or a position | Synonyms: install |
| 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 |
| instructional | (adjective) of or relating to or used in instruction | - |
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| instrumental | (adjective) relating to or designed for or performed on musical instruments | - |
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| (adjective) serving or acting as a means or aid | Synonyms: implemental, subservient |
| insubstantial | (adjective) lacking material form or substance; unreal | Synonyms: unreal, unsubstantial |
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| (adjective) lacking in nutritive value | - |
| (adjective) lacking solidity or strength | Synonyms: flimsy |
| insurrectional | (adjective) of or relating to or given to insurrection | Synonyms: insurrectionary |
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| integral | (adjective) of or denoted by an integer | - |
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| (adjective) existing as an essential constituent or characteristic | Synonyms: built-in, constitutional, inbuilt, inherent |
| (adjective) constituting the undiminished entirety; lacking nothing essential especially not damaged | Synonyms: entire, intact |
| (noun) the result of a mathematical integration; F(x) is the integral of f(x) if dF/dx = f(x) | - |
| integumental | (adjective) of or relating to the integument | Synonyms: integumentary |
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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 |
| intensional | (adjective) used of the set of attributes that distinguish the referents of a given word | - |
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| intentional | (adjective) done or made or performed with purpose and intent | Synonyms: designed, unintentional |
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| (adjective) characterized by conscious design or purpose | Synonyms: deliberate, knowing |
| interactional | (adjective) capable of acting on or influencing each other | Synonyms: interactive |
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| intercontinental | (adjective) extending or taking place between or among continents | - |
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| intercostal | (adjective) located or occurring between the ribs | - |
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| (noun) muscles between the ribs; they contract during inspiration | Synonyms: intercostal muscle, musculus intercostalis |
| interdenominational | (adjective) occurring between or among or common to different churches or denominations | Synonyms: interchurch |
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| interdepartmental | (adjective) between or among departments | - |
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| (adverb) between departments | - |
| interfacial | (adjective) relating to or situated at an interface | - |
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| interlineal | (adjective) written between lines of text | Synonyms: interlinear |
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| intermural | (adjective) between two or more institutions etc | - |
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| internal | (adjective) happening or arising or located within some limits or especially surface | - |
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| (adjective) inside the country | Synonyms: home, interior, national |
| (adjective) occurring within an institution or community | Synonyms: intragroup |
| (adjective) innermost or essential | Synonyms: inner, intimate |
| (adjective) located inward | Synonyms: inner, interior |
| international | (adjective) concerning or belonging to all or at least two or more nations | - |
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| (adjective) from or between other countries | Synonyms: external, outside |
| interpersonal | (adjective) occurring among or involving several people | - |
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| interracial | (adjective) involving or composed of different races | Synonyms: mixed |
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| (adjective) between races | - |
| intersexual | (adjective) having sexual characteristics intermediate between those of male and female | - |
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| (adjective) existing or occurring between the sexes | - |
| interspersal | (noun) the act of combining one thing at intervals among other things | Synonyms: interspersion |
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| interstitial | (adjective) of or relating to interstices | - |
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| intertidal | (adjective) of or relating to the littoral area above the low-tide mark | - |
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| intertribal | (adjective) between or among tribes | - |
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| interval | (noun) the distance between things | Synonyms: separation |
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| (noun) a set containing all points (or all real numbers) between two given endpoints | - |
| (noun) the difference in pitch between two notes | Synonyms: musical interval |
| (noun) a definite length of time marked off by two instants | Synonyms: time interval |
| intervertebral | (adjective) pertaining to the space between two vertebrae | - |
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| intestinal | (adjective) of or relating to or inside the intestines | Synonyms: enteral, enteric |
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| intimal | (adjective) of or relating to the intima | - |
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| intracerebral | (adjective) within the brain | - |
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| intracranial | (adjective) within the skull | - |
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| intradepartmental | (adjective) within a department | - |
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| intradermal | (adjective) relating to areas between the layers of the skin | Synonyms: intracutaneous, intradermic |
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| intramural | (adjective) carried on within the bounds of an institution or community | - |
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| intrasentential | (adjective) of or relating to constituents within a sentence | - |
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| intrinsical | (adjective) belonging to a thing by its very nature | Synonyms: intrinsic |
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| invitational | (adjective) pertaining to or characteristic of an invitation | - |
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| ipsilateral | (adjective) on or relating to the same side (of the body) | - |
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| ironical | (adjective) humorously sarcastic or mocking | Synonyms: dry, ironic, wry |
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| (adjective) characterized by often poignant difference or incongruity between what is expected and what actually is | Synonyms: ironic |
| irrational | (adjective) not consistent with or using reason | - |
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| (adjective) real but not expressible as the quotient of two integers | - |
| (noun) a real number that cannot be expressed as a rational number | Synonyms: irrational number |
| isobilateral | (adjective) having identical parts on each side of an axis | Synonyms: bilateral, bilaterally symmetric, bilaterally symmetrical |
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| isochronal | (adjective) equal in duration or interval | Synonyms: isochronous |
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| isoclinal | (adjective) having equal magnetic inclinations | Synonyms: isoclinic |
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| (noun) an isogram connecting points of equal magnetic inclination | Synonyms: isoclinic line |
| isometrical | (adjective) having equal dimensions or measurements | Synonyms: isometric |
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| isoseismal | (noun) a line on a map connecting points at which earthquake shocks are of equal intensity. | - |
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| isothermal | (adjective) of a process or change taking place at constant temperature | - |
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| jackal | (noun) Old World nocturnal canine mammal closely related to the dog; smaller than a wolf; sometimes hunts in a pack but usually singly or as a member of a pair | - |
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| (noun) a jackal native to Europe and Asia with a golden coat | Synonyms: Canis aureus, golden jackal |
| (noun) a jackal native to Africa with a black back | Synonyms: black-backed jackal, Canis mesomelas |
| (noun) a jackal native to Southern Africa with a stripe down its side | Synonyms: Canis adustus, side-striped jackal |
| (noun) a canid living in the deserts of Northern Africa related to the goldn jackal and the grey wolf | Synonyms: African golden wolf, Canis anthus, Egyptian jackal, grey jackal |
| journal | (noun) the part of the axle contained by a bearing | - |
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| (noun) a record book as a physical object | - |
| (noun) a periodical dedicated to a particular subject | - |
| (noun) a daily written record of (usually personal) experiences and observations | Synonyms: diary |
| (noun) a ledger in which transactions have been recorded as they occurred | Synonyms: daybook |
| jovial | (adjective) full of or showing high-spirited merriment | Synonyms: gay, jocund, jolly, merry, mirthful |
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| judgmental | (adjective) depending on judgment | - |
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| judicial | (adjective) relating to the administration of justice or the function of a judge | Synonyms: juridic, juridical |
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| (adjective) belonging or appropriate to the office of a judge | - |
| (adjective) expressing careful judgment | Synonyms: discriminative |
| (adjective) decreed by or proceeding from a court of justice | - |
| jumbal | (noun) small flat ring-shaped cake or cookie | Synonyms: jumble |
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| jural | (adjective) of or relating to law or to legal rights and obligations | Synonyms: juristic |
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| juridical | (adjective) relating to the administration of justice or the function of a judge | Synonyms: judicial, juridic |
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| (adjective) of or relating to the law or jurisprudence | Synonyms: juridic |
| jurisdictional | (adjective) restricted to the geographic area under a particular jurisdiction | - |
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| jurisprudential | (adjective) relating to the science or philosophy of law or a system of laws | - |
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| kaleidoscopical | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopic |
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| kindjal | (noun) a kind of short sword or dagger with a slightly curved blade, probably originated in Chechnya. | - |
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| kraal | (noun) a pen for livestock in southern Africa | - |
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| (noun) a village of huts for native Africans in southern Africa; usually surrounded by a stockade | - |
| labial | (adjective) relating to or near the female labium | - |
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| (adjective) of or relating to the lips of the mouth | - |
| (noun) a consonant whose articulation involves movement of the lips | Synonyms: labial consonant |
| labiodental | (noun) a consonant whose articulation involves the lips and teeth | Synonyms: labiodental consonant |
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| lachrymal | (adjective) of or relating to tears | Synonyms: lacrimal |
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| (adjective) relating to or located near the organ that produces tears | Synonyms: lacrimal |
| lackadaisical | (adjective) idle or indolent especially in a dreamy way | - |
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| (adjective) lacking spirit or liveliness | Synonyms: dreamy, languid, languorous |
| lacrimal | (adjective) of or relating to tears | Synonyms: lachrymal |
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| (adjective) relating to or located near the organ that produces tears | Synonyms: lachrymal |
| lacteal | (adjective) relating to or consisting of or producing or resembling milk | - |
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| (noun) any of the lymphatic vessels that convey chyle from the small intestine to the thoracic duct | - |
| laminal | (adjective) arranged in or consisting of laminae | Synonyms: laminar |
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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 | - |
| laryngeal | (adjective) of or relating to or situated in the larynx | - |
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| laryngopharyngeal | (adjective) of or relating to the larynx and pharynx | - |
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| lateral | (adjective) lying away from the median and sagittal plane of a body | - |
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| (adjective) situated at or extending to the side | Synonyms: sidelong |
| (noun) a pass to a receiver upfield from the passer | Synonyms: lateral pass |
| latitudinal | (adjective) of or relating to latitudes north or south | - |
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| leal | (adjective) faithful and true | - |
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| legal | (adjective) established by or founded upon law or official or accepted rules | - |
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| (adjective) of or relating to jurisprudence | - |
| (adjective) relating to or characteristic of the profession of law | - |
| (adjective) allowed by official rules | - |
| (adjective) having legal efficacy or force | Synonyms: effectual, sound |
| lethal | (adjective) of an instrument of certain death | Synonyms: deadly |
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| lexical | (adjective) of or relating to words | - |
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| (adjective) of or relating to dictionaries | - |
| lexicographical | (adjective) of or relating to lexicography | Synonyms: lexicographic |
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| liberal | (adjective) tolerant of change; not bound by authoritarianism, orthodoxy, or tradition | - |
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| (adjective) showing or characterized by broad-mindedness | Synonyms: broad, large-minded, tolerant |
| (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, openhanded |
| (adjective) not literal | Synonyms: free, loose |
| (adjective) having political or social views favoring reform and progress | - |
| (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberalist, progressive |
| (noun) a person who favors an economic theory of laissez-faire and self-regulating markets | - |
| libidinal | (adjective) belonging to the libido | - |
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| lienal | (adjective) of or relating to the spleen | Synonyms: splenetic, splenic |
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| limnological | (adjective) of or relating to limnology | - |
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| lineal | (adjective) in a straight unbroken line of descent from parent to child | Synonyms: direct |
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| (adjective) arranged in a line | - |
| lingual | (adjective) consisting of or related to language | Synonyms: linguistic |
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| (adjective) pertaining to or resembling or lying near the tongue | - |
| (noun) a consonant that is produced with the tongue and other speech organs | - |
| literal | (adjective) limited to the explicit meaning of a word or text | - |
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| (adjective) without interpretation or embellishment | - |
| (adjective) avoiding embellishment or exaggeration (used for emphasis) | - |
| (adjective) being or reflecting the essential or genuine character of something | Synonyms: actual, genuine, real |
| (noun) a mistake in printed matter resulting from mechanical failures of some kind | Synonyms: erratum, literal error, misprint, typo, typographical error |
| litoral | (noun) the region of the shore of a lake or sea or ocean | Synonyms: littoral, littoral zone, sands |
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| littoral | (adjective) of or relating to a coastal or shore region | - |
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| (noun) the region of the shore of a lake or sea or ocean | Synonyms: litoral, littoral zone, sands |
| liturgical | (adjective) of or relating to or in accord with liturgy | - |
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| local | (adjective) relating to or applicable to or concerned with the administration of a city or town or district rather than a larger area | - |
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| (adjective) affecting only a restricted part or area of the body | - |
| (adjective) of or belonging to or characteristic of a particular locality or neighborhood | - |
| (noun) public transport consisting of a bus or train that stops at all stations or stops | - |
| (noun) anesthetic that numbs a particular area of the body | Synonyms: local anaesthetic, local anesthetic, topical anaesthetic, topical anesthetic |
| logical | (adjective) capable of or reflecting the capability for correct and valid reasoning | - |
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| (adjective) marked by an orderly, logical, and aesthetically consistent relation of parts | Synonyms: coherent, consistent, ordered |
| (adjective) capable of thinking and expressing yourself in a clear and consistent manner | Synonyms: coherent, lucid |
| (adjective) based on known statements or events or conditions | Synonyms: legitimate |
| logistical | (adjective) of or relating to logistics | Synonyms: logistic |
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