| endocrinal | (adjective) of or belonging to endocrine glands or their secretions | Synonyms: endocrine |
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| eternal | (adjective) tiresomely long; seemingly without end | Synonyms: endless, interminable |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, everlasting, perpetual, unceasing, unending |
| exceptional | (adjective) deviating widely from a norm of physical or mental ability; used especially of children below normal in intelligence | - |
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| (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, olympian, prodigious, surpassing |
| (adjective) surpassing what is common or usual or expected | Synonyms: especial, particular, special |
| extensional | (adjective) defining a word by listing the class of entities to which the word correctly applies | - |
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| external | (adjective) happening or arising or located outside or beyond some limits or especially surface | - |
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| (adjective) coming from the outside | Synonyms: extraneous, outside |
| (adjective) from or between other countries | Synonyms: international, outside |
| (adjective) purely outward or superficial | - |
| fictional | (adjective) related to or involving literary fiction | - |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictitious |
| final | (adjective) occurring at or forming an end or termination | Synonyms: concluding, last, terminal |
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| (adjective) conclusive in a process or progression | Synonyms: last, net |
| (adjective) not to be altered or undone | Synonyms: last |
| fractional | (adjective) constituting or comprising a part or fraction of a possible whole or entirety | Synonyms: partial |
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| (adjective) constituting a division or an aliquot part of the basic monetary unit | Synonyms: divisional |
| fraternal | (adjective) (of twins) derived from two separate fertilized ova | Synonyms: biovular |
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| (adjective) like or characteristic of or befitting a brother | Synonyms: brotherlike, brotherly |
| (adjective) of or relating to a fraternity or society of usually men | - |
| frictional | (adjective) pertaining to or worked or produced by friction | - |
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| functional | (adjective) designed for or capable of a particular function or use | - |
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| (adjective) involving or affecting function rather than physiology | - |
| (adjective) relating to or based on function especially as opposed to structure | - |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: operative, running, working |
| (adjective) designed for or adapted to a function or use | - |
| (adjective) fit or ready for use or service | Synonyms: operable, operational, usable, useable |
| gastroduodenal | (adjective) of or relating to the stomach and the duodenum | - |
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| gastrointestinal | (adjective) of or relating to the stomach and intestines | Synonyms: GI |
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| generational | (adjective) of or relating to a generation | - |
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| germinal | (adjective) containing seeds of later development | Synonyms: originative, seminal |
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| gestational | (adjective) of or relating to gestation | - |
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| gradational | (adjective) taking place by degrees | Synonyms: gradatory, graduated |
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| gravitational | (adjective) of or relating to or caused by gravitation | Synonyms: gravitative |
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| hexagonal | (adjective) having six sides or divided into hexagons | Synonyms: hexangular |
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| hibernal | (adjective) characteristic of or relating to winter | Synonyms: brumal, hiemal |
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| hominal | (adjective) of humankind as a species | - |
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| hormonal | (adjective) of or relating to or caused by hormones | - |
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| hymenal | (adjective) of or relating to the hymen | - |
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| ideational | (adjective) being of the nature of a notion or concept | Synonyms: conceptional, notional |
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| illusional | (adjective) marked by or producing illusion | Synonyms: illusionary |
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| impersonal | (adjective) not relating to or responsive to individual persons | - |
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| (adjective) having no personal preference | Synonyms: neutral |
| implicational | (adjective) relating to or concerned with logical implication | - |
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| infernal | (adjective) being of the underworld | - |
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| (adjective) characteristic of or resembling Hell | - |
| (adjective) of or pertaining to or characteristic of a very uncontrolled and intense fire | - |
| (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned |
| (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy |
| inflectional | (adjective) characterized by inflections indicating grammatical distinctions | - |
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| informational | (adjective) relating to or having the nature of information | - |
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| inguinal | (adjective) of or relating to or near the groin | - |
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| innovational | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: groundbreaking, innovative |
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| inspirational | (adjective) imparting a divine influence on the mind and soul | - |
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| 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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| insurrectional | (adjective) of or relating to or given to insurrection | Synonyms: insurrectionary |
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| 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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| interdenominational | (adjective) occurring between or among or common to different churches or denominations | Synonyms: interchurch |
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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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| intestinal | (adjective) of or relating to or inside the intestines | Synonyms: enteral, enteric |
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| invitational | (adjective) pertaining to or characteristic of an invitation | - |
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| irrational | (adjective) not consistent with or using reason | - |
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| (adjective) real but not expressible as the quotient of two integers | - |
| 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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| jurisdictional | (adjective) restricted to the geographic area under a particular jurisdiction | - |
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| laminal | (adjective) arranged in or consisting of laminae | Synonyms: laminar |
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| latitudinal | (adjective) of or relating to latitudes north or south | - |
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| 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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| longitudinal | (adjective) of or relating to lines of longitude | - |
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| (adjective) running lengthwise | - |
| (adjective) over an extended time | - |
| marginal | (adjective) of questionable or minimal quality | Synonyms: borderline |
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| (adjective) just barely adequate or within a lower limit | Synonyms: bare |
| (adjective) at or constituting a border or edge | Synonyms: fringy |
| (adjective) producing at a rate that barely covers production costs | - |
| maternal | (adjective) characteristic of a mother | - |
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| (adjective) relating to or characteristic of or befitting a parent | Synonyms: parental, paternal |
| (adjective) relating to or derived from one's mother | - |
| (adjective) related on the mother's side | Synonyms: enate, enatic |
| maturational | (adjective) relating to or involved in maturation | - |
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| matutinal | (adjective) pertaining to or occurring in the morning | - |
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| medicinal | (adjective) having the properties of medicine | Synonyms: medicative |
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| meridional | (adjective) of or relating to a meridian | - |
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| (adjective) located in the south or characteristic of southern people or places | - |
| migrational | (adjective) of or related to migration | - |
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| missional | (adjective) relating to or connected to a religious mission | Synonyms: missionary |
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| monoclinal | (adjective) of a geological structure in which all strata are inclined in the same direction | - |
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| monoclonal | (adjective) forming or derived from a single clone | - |
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| motional | (adjective) of or relating to or characterized by motion | - |
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| motivational | (adjective) of or relating to motivation | - |
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| multidimensional | (adjective) having or involving or marked by several dimensions or aspects | - |
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| multinational | (adjective) involving or operating in several nations or nationalities | Synonyms: transnational |
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| mutational | (adjective) of or relating to or resulting from mutation | - |
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| national | (adjective) limited to or in the interests of a particular nation | - |
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| (adjective) concerned with or applicable to or belonging to an entire nation or country | - |
| (adjective) of or relating to or belonging to a nation or country | - |
| (adjective) of or relating to nationality | - |
| (adjective) characteristic of or peculiar to the people of a nation | - |
| (adjective) inside the country | Synonyms: home, interior, internal |
| (adjective) owned or maintained for the public by the national government | - |
| navigational | (adjective) of or relating to navigation | - |
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| neuronal | (adjective) of or relating to neurons | Synonyms: neural, neuronic |
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| nocturnal | (adjective) belonging to or active during the night | - |
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| (adjective) of or relating to or occurring in the night | - |
| nominal | (adjective) of, relating to, or characteristic of an amount that is not adjusted for inflation | - |
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| (adjective) pertaining to a noun or to a word group that functions as a noun | - |
| (adjective) relating to or constituting or bearing or giving a name | - |
| (adjective) existing in name only | Synonyms: titular |
| (adjective) insignificantly small; a matter of form only (`tokenish' is informal) | Synonyms: token, tokenish |
| (adjective) named; bearing the name of a specific person | Synonyms: nominative |
| nondenominational | (adjective) not restricted to a particular religious denomination | - |
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| nonfictional | (adjective) not fictional | - |
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| nonfunctional | (adjective) not having or performing a function | - |
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| (adjective) not performing or able to perform its regular function | Synonyms: malfunctioning |
| noninstitutional | (adjective) not institutional | - |
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| nonmedicinal | (adjective) not having a medicinal effect or not medically prescribed | Synonyms: unmedical, unmedicative, unmedicinal |
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| nonoperational | (adjective) (military) not involved in military operations | Synonyms: inactive |
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| nonpersonal | (adjective) lacking personality | - |
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| nonprofessional | (adjective) not professional; not engaged in a profession or engaging in as a profession or for gain | - |
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| nonrational | (adjective) obtained through intuition rather than from reasoning or observation | Synonyms: intuitive, visceral |
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| (adjective) not based on reason | - |
| nonrecreational | (adjective) involving gainful employment in something often done as a hobby | Synonyms: paid |
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| nonrepresentational | (adjective) of or relating to a style of art in which objects do not resemble those known in physical nature | - |
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| nontraditional | (adjective) not conforming to or in accord with tradition | Synonyms: untraditional |
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| nontranslational | (adjective) of or relating to movement that is not uniform or not without rotation | - |
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| notional | (adjective) being of the nature of a notion or concept | Synonyms: conceptional, ideational |
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| (adjective) indulging in or influenced by fancy | Synonyms: fanciful |
| (adjective) not based on fact or investigation | Synonyms: speculative |
| (adjective) not based on fact; existing only in the imagination | Synonyms: fanciful, imaginary |
| nutritional | (adjective) of or relating to or providing nutrition | Synonyms: nutritionary |
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| obligational | (adjective) relating or constituting or qualified to create a legal or financial obligation | - |
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| observational | (adjective) relying on observation or experiment | Synonyms: data-based, experimental |
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| obsessional | (adjective) characterized by or constituting an obsession | Synonyms: obsessive |
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| occasional | (adjective) occurring from time to time | - |
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| (adjective) occurring on a temporary or irregular basis | Synonyms: casual |
| (adjective) recurring or reappearing from time to time | Synonyms: periodic |
| (adjective) occurring or appearing at usually irregular intervals | Synonyms: episodic |
| occupational | (adjective) of or relating to the activity or business for which you are trained | - |
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| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
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| omnidirectional | (adjective) not directional | - |
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| operational | (adjective) (military) of or intended for or involved in military operations | - |
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| (adjective) pertaining to a process or series of actions for achieving a result | - |
| (adjective) being in effect or operation | Synonyms: in operation, operating |
| (adjective) fit or ready for use or service | Synonyms: functional, operable, usable, useable |
| optional | (adjective) possible but not necessary; left to personal choice | - |
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| ordinal | (adjective) being or denoting a numerical order in a series | - |
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| (adjective) of or relating to a taxonomic order | - |
| organisational | (adjective) of or relating to an organization | Synonyms: organizational |
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