| auburn | (adjective) (of hair) colored a moderate reddish-brown | - |
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| auctorial | (adjective) of or by or typical of an author | Synonyms: authorial |
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| audacious | (adjective) disposed to venture or take risks | Synonyms: daring, venturesome, venturous |
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| (adjective) invulnerable to fear or intimidation | Synonyms: brave, dauntless, fearless, hardy, intrepid, unfearing |
| (adjective) unrestrained by convention or propriety | Synonyms: bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen, insolent |
| audible | (adjective) heard or perceptible by the ear | Synonyms: hearable |
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| audile | (adjective) of or relating to the process of hearing | Synonyms: auditive, auditory |
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| audiometric | (adjective) of or relating to audiometry | - |
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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| auditive | (adjective) of or relating to the process of hearing | Synonyms: audile, auditory |
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| auditory | (adjective) of or relating to the process of hearing | Synonyms: audile, auditive |
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| augitic | (adjective) of or relating to or containing the mineral augite | - |
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| augmentative | (adjective) increasing or having the power to increase especially in size or amount or degree | - |
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| (adjective) intensifying by augmentation and enhancement | Synonyms: enhancive |
| augmented | (adjective) added to or made greater in amount or number or strength | - |
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| august | (adjective) profoundly honored | Synonyms: revered, venerable |
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| (adjective) of or befitting a lord | Synonyms: grand, lordly |
| auld | (adjective) a Scottish word | - |
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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 | - |
| aureate | (adjective) having the deep slightly brownish color of gold | Synonyms: gilded, gilt, gold, golden |
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| (adjective) elaborately or excessively ornamented | Synonyms: flamboyant, florid |
| auric | (adjective) of or relating to or containing or derived from gold | Synonyms: aurous |
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| auricular | (adjective) of or relating to near the ear | Synonyms: otic |
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| (adjective) pertaining to an auricle of the heart | - |
| (adjective) relating to or perceived by or shaped like the organ of hearing | - |
| auriculate | (adjective) having auricles | Synonyms: auriculated |
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| auriculated | (adjective) having auricles | Synonyms: auriculate |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| auriform | (adjective) having a shape resembling an ear | Synonyms: ear-like, ear-shaped |
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| auroral | (adjective) characteristic of the dawn | Synonyms: aurorean |
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| (adjective) of or relating to the atmospheric phenomenon auroras | - |
| aurorean | (adjective) characteristic of the dawn | Synonyms: auroral |
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| aurous | (adjective) of or relating to or containing or derived from gold | Synonyms: auric |
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| auscultatory | (adjective) of or relating to auscultation | - |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| austenitic | (adjective) composed of austenite | - |
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| austere | (adjective) practicing great self-denial | Synonyms: ascetic, ascetical, spartan |
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| (adjective) of a stern or strict bearing or demeanor; forbidding in aspect | Synonyms: stern |
| (adjective) severely simple | Synonyms: severe, stark, stern |
| austral | (adjective) of the south or coming from the south | - |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| autarchic | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchical, autarkical |
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| autarchical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarkical |
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| autarkic | (adjective) of countries; not relying on imports | Synonyms: 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 |
| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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| autistic | (adjective) characteristic of or affected with autism | - |
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| autobiographic | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographical |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographical |
| 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 |
| autocatalytic | (adjective) relating to or proceeding by autocatalysis | - |
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| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autochthonic | (adjective) originating where it is found | Synonyms: autochthonal, autochthonous, endemic, indigenous |
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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| autocratic | (adjective) offensively self-assured or given to exercising usually unwarranted power | Synonyms: bossy, dominating, high-and-mighty, magisterial, peremptory |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: authoritarian, despotic, dictatorial, tyrannic, tyrannical |
| autodidactic | (adjective) relating to or having the characteristics of an autodidact | - |
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| autoecious | (adjective) of parasites especially rust fungi; completing the entire life cycle on a single host | Synonyms: homoecious |
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| autoerotic | (adjective) sexually satisfying yourself (as by masturbation) | - |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| autogamic | (adjective) characterized by or fit for autogamy | Synonyms: autogamous |
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| autogamous | (adjective) characterized by or fit for autogamy | Synonyms: autogamic |
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| autogenetic | (adjective) of or relating to autogenesis | - |
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| autogenic | (adjective) originating within the body | Synonyms: autogenous |
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| autogenous | (adjective) originating within the body | Synonyms: autogenic |
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| autographed | (adjective) bearing an autograph | - |
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| autographic | (adjective) written in the author's own handwriting | - |
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| autoicous | (adjective) having male and female reproductive organs in separate clusters on the same plant | - |
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| autoimmune | (adjective) of or relating to the immune response of the body against substance normally present in the body | - |
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| autoloading | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: self-loading, semiautomatic |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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| autolytic | (adjective) of or relating to self-digestion | - |
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| automated | (adjective) operated by automation | Synonyms: machine-controlled, machine-driven |
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| automatic | (adjective) operating with minimal human intervention; independent of external control | - |
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| (adjective) without volition or conscious control | Synonyms: reflex, reflexive |
| (adjective) resembling the unthinking functioning of a machine | Synonyms: automatonlike, machinelike, robotic, robotlike |
| automatonlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, machinelike, robotic, robotlike |
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| automotive | (adjective) of or relating to motor vehicles | - |
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| (adjective) containing within itself the means of propulsion or movement | Synonyms: self-propelled, self-propelling |
| autonomic | (adjective) relating to or controlled by the autonomic nervous system | - |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| autophytic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autotrophic |
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| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autosemantic | (adjective) of a word or phrase meaningful in isolation, independent of context | - |
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| autosomal | (adjective) of or relating to an autosome | - |
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| autotelic | (adjective) of or relating to or believing in autotelism | - |
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| autotomic | (adjective) of or relating to autotomy | - |
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| autotrophic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autophytic |
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| autotypic | (adjective) of or relating to autotypy | - |
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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 | - |
| auxetic | (adjective) of or relating to growth by auxesis | - |
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| auxiliary | (adjective) functioning in a supporting capacity | Synonyms: subsidiary, supplemental, supplementary |
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| (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, ancillary, appurtenant |
| auxinic | (adjective) relating to or containing auxins | - |
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