| associational | (adjective) of or relating to associations or associationism | - |
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| asterismal | (adjective) relating to asterisms or constellations | - |
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| asternal | (adjective) not connected to the sternum or breastbone | - |
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| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| astomatal | (adjective) lacking a stoma or stomata | - |
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| astral | (adjective) being or relating to or resembling or emanating from stars | Synonyms: stellar |
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| astrological | (adjective) relating to or concerned with astrology | - |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| astronomical | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomic |
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| (adjective) inconceivably large | Synonyms: astronomic, galactic |
| astrophysical | (adjective) of or concerned with astrophysics | - |
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| asymmetrical | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetric |
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| (adjective) irregular in shape or outline | Synonyms: crooked |
| atheistical | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistic |
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| (adjective) rejecting any belief in gods | Synonyms: atheistic, unbelieving |
| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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| atonal | (adjective) characterized by avoidance of traditional western tonality | Synonyms: unkeyed |
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| atrial | (adjective) of or relating to a cavity or chamber in the body (especially one of the upper chambers of the heart) | - |
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| attentional | (adjective) of or relating to attention | - |
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| attitudinal | (adjective) of or relating to attitudes | - |
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| attritional | (adjective) relating to or caused by attrition | - |
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| atypical | (adjective) not representative of a group, class, or type | Synonyms: atypic, untypical |
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| (adjective) deviating from normal expectations; somewhat odd, strange, or abnormal | Synonyms: irregular |
| auctorial | (adjective) of or by or typical of an author | Synonyms: authorial |
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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| aural | (adjective) relating to or characterized by an aura | - |
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| (adjective) of or pertaining to hearing or the ear | - |
| auroral | (adjective) characteristic of the dawn | Synonyms: aurorean |
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| (adjective) of or relating to the atmospheric phenomenon auroras | - |
| austral | (adjective) of the south or coming from the south | - |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| autarchical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarkical |
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| autarkical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarchical |
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| (adjective) of countries; not relying on imports | Synonyms: autarkic |
| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| autobiographical | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographic |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographic |
| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autosomal | (adjective) of or relating to an autosome | - |
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| autumnal | (adjective) of or characteristic of or occurring in autumn | - |
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| (adjective) characteristic of late maturity verging on decline | - |
| avifaunal | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunistic |
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| avocational | (adjective) of or involved in an avocation | - |
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| awful | (adjective) offensive or even (of persons) malicious | Synonyms: nasty |
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| (adjective) causing fear or dread or terror | Synonyms: dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
| (adjective) exceptionally bad or displeasing | Synonyms: abominable, atrocious, dreadful, painful, terrible, unspeakable |
| (adjective) extreme in degree or extent or amount or impact | Synonyms: frightful, terrible, tremendous |
| (adjective) inspiring awe or admiration or wonder | Synonyms: amazing, awe-inspiring, awesome, awing |
| (adjective) inspired by a feeling of fearful wonderment or reverence | Synonyms: awed |
| awheel | (adjective) traveling by wheeled vehicle such as bicycle or automobile e.g. | - |
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| awol | (adjective) absent without permission | Synonyms: truant |
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| axial | (adjective) of or relating to or resembling an axis of rotation | - |
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| (adjective) relating to or attached to the axis | Synonyms: axile |
| (adjective) situated on or along or in the direction of an axis | - |
| axiological | (adjective) of or relating to the study of values | - |
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| axiomatical | (adjective) of or relating to or derived from axioms | Synonyms: axiomatic, postulational |
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| axonal | (adjective) of or relating to or resembling an axon | - |
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| azimuthal | (adjective) of or relating to or in azimuth | - |
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| azonal | (adjective) not divided into zones | - |
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| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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| bacterial | (adjective) relating to or caused by bacteria | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| baleful | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: forbidding, menacing, minacious, minatory, ominous, sinister, threatening |
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| (adjective) deadly or sinister | Synonyms: baneful |
| banal | (adjective) repeated too often; overfamiliar through overuse | Synonyms: commonplace, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
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| baneful | (adjective) deadly or sinister | Synonyms: baleful |
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| (adjective) exceedingly harmful | Synonyms: deadly, pernicious, pestilent |
| baptismal | (adjective) of or relating to baptism | - |
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| barometrical | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometric |
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| baronial | (adjective) impressive in size, manner, or appearance | Synonyms: imposing, noble, stately |
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| basal | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: radical |
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| (adjective) serving as or forming a base | Synonyms: base |
| (adjective) of or being the essential or basic part | Synonyms: elemental, elementary, primary |
| bashful | (adjective) disposed to avoid notice | Synonyms: blate |
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| (adjective) self-consciously timid | - |
| basidial | (adjective) relating to or characterized by basidia | - |
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| basinal | (adjective) of or relating to a basin | - |
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| basipetal | (adjective) of leaves or flowers; developing or opening in succession from apex to base | - |
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| bathyal | (adjective) relating to ocean depths between 200 and 2000 meters (corresponds to the continental slope) | - |
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| bathymetrical | (adjective) of or relating to measurements of the depths of oceans or lakes | Synonyms: bathymetric |
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| battleful | (adjective) having or showing a ready disposition to fight | Synonyms: bellicose, combative |
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| beautiful | (adjective) delighting the senses or exciting intellectual or emotional admiration | - |
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| (adjective) (of weather) highly enjoyable | - |
| behavioral | (adjective) of or relating to behavior | Synonyms: behavioural |
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| behavioural | (adjective) of or relating to behavior | Synonyms: behavioral |
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| beneficial | (adjective) promoting or enhancing well-being | Synonyms: good |
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| benthal | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthic, benthonic |
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| bestial | (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, brutal, brute, brutish |
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| biannual | (adjective) occurring or payable twice each year | Synonyms: biyearly, half-yearly, semiannual |
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| biaural | (adjective) relating to or having or hearing with two ears | Synonyms: binaural |
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| biaxal | (adjective) having two axes | Synonyms: biaxate, biaxial |
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| biaxial | (adjective) having two axes | Synonyms: biaxal, biaxate |
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| biblical | (adjective) of or pertaining to or contained in or in accordance with the Bible | Synonyms: scriptural |
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| (adjective) in keeping with the nature of the Bible or its times or people | - |
| bibliographical | (adjective) relating to or dealing with bibliography | Synonyms: bibliographic |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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| bibliothecal | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecarial |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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| bicameral | (adjective) composed of two legislative bodies | - |
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| (adjective) consisting of two chambers | Synonyms: two-chambered |
| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| bicipital | (adjective) having two heads or points of origin as a biceps | - |
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| bicylindrical | (adjective) having two cylindrical surfaces usually with parallel axes | - |
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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| bifacial | (adjective) having two faces or fronts | Synonyms: biface |
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| bifocal | (adjective) having two foci | - |
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| bigeminal | (adjective) occurring in pairs | - |
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| bilabial | (adjective) of or relating to or being a speech sound that is articulated using both lips | - |
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| bilateral | (adjective) having two sides or parts | Synonyms: two-sided |
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| (adjective) affecting or undertaken by two parties | - |
| (adjective) having identical parts on each side of an axis | Synonyms: bilaterally symmetric, bilaterally symmetrical, isobilateral |
| bilingual | (adjective) using or knowing two languages | - |
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| bimanual | (adjective) requiring two hands or designed for two people | Synonyms: two-handed |
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| bimestrial | (adjective) two months long; lasting two months | - |
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| (adjective) occurring every two months | Synonyms: bimonthly |
| bimetal | (adjective) formed of two different metals or alloys; especially in sheets bonded together | Synonyms: bimetallic |
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| bimillenial | (adjective) of or relating to a bimillennium | - |
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| bimodal | (adjective) of a distribution; having or occurring with two modes | - |
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| binaural | (adjective) relating to or having or hearing with two ears | Synonyms: biaural |
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| binomial | (adjective) of or relating to or consisting of two terms | - |
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| (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binominal |
| binominal | (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binomial |
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| biochemical | (adjective) of or relating to biochemistry; involving chemical processes in living organisms | - |
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