| antiauthoritarian | (adjective) opposed to authoritarianism | - |
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| author | (noun) writes (books or stories or articles or the like) professionally (for pay) | Synonyms: writer |
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| (noun) someone who originates or causes or initiates something | Synonyms: generator, source |
| (verb) be the author of | - |
| authoress | (noun) a woman author | - |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| authorise | (verb) grant authorization or clearance for | Synonyms: authorize, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorize, empower |
| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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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 |
| (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| 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 |
| authoritatively | (adverb) in an authoritative and magisterial manner | Synonyms: magisterially |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| authorize | (verb) grant authorization or clearance for | Synonyms: authorise, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorise, empower |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| authorship | (noun) the act of creating written works | Synonyms: composition, penning, writing |
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| (noun) the act of initiating a new idea or theory or writing | Synonyms: paternity |
| blackthorn | (noun) erect and almost thornless American hawthorn with somewhat pear-shaped berries | Synonyms: Crataegus calpodendron, Crataegus tomentosa, pear haw, pear hawthorn |
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| (noun) a thorny Eurasian bush with plumlike fruits | Synonyms: Prunus spinosa, sloe |
| boxthorn | (noun) any of various shrubs or vines of the genus Lycium with showy flowers and bright berries | Synonyms: matrimony vine |
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| buckthorn | (noun) any shrub or small tree of the genus Bumelia | - |
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| (noun) a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments | - |
| (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ribwort, ripple-grass |
| carthorse | (noun) draft horse kept for pulling carts | Synonyms: cart horse, drayhorse |
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| coauthor | (noun) a writer who collaborates with others in writing something | Synonyms: joint author |
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| firethorn | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, pyracanth, Pyracantha |
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| haemothorax | (noun) accumulation of blood in the pleural cavity (the space between the lungs and the walls of the chest) | Synonyms: hemothorax |
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| hawthorn | (noun) a spring-flowering shrub or small tree of the genus Crataegus | Synonyms: haw |
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| hemothorax | (noun) accumulation of blood in the pleural cavity (the space between the lungs and the walls of the chest) | Synonyms: haemothorax |
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| hydrothorax | (noun) accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys | - |
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| opisthorchiasis | (noun) infestation with flukes obtained from eating raw fish; common in eastern Asia | - |
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| parathormone | (noun) hormone synthesized and released into the blood stream by the parathyroid glands; regulates phosphorus and calcium in the body and functions in neuromuscular excitation and blood clotting | Synonyms: parathyroid hormone |
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| plethora | (noun) extreme excess | Synonyms: embarrassment, overplus, superfluity |
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| plethoric | (adjective) excessively abundant | Synonyms: overabundant, rife |
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| pneumothorax | (noun) abnormal presence of air in the pleural cavity resulting in the collapse of the lung; may be spontaneous (due to injury to the chest) or induced (as a treatment for tuberculosis) | - |
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| prothorax | (noun) the anterior part of an insect's thorax; bears the first pair of legs | - |
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| radiothorium | (noun) radioactive isotope of thorium with mass number 228 | Synonyms: thorium-228 |
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| shorthorn | (noun) English breed of short-horned cattle | Synonyms: Durham |
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| thoracentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracocentesis |
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| thoracic | (adjective) of or relating to the chest or thorax | Synonyms: pectoral |
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| thoracocentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracentesis |
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| thoracotomy | (noun) surgical incision into the chest walls opening up the pleural cavity | - |
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| thorax | (noun) part of an insect's body that bears the wings and legs | - |
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| (noun) the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates | Synonyms: chest, pectus |
| (noun) the middle region of the body of an arthropod between the head and the abdomen | - |
| thoriate | (verb) impregnate with thorium oxide to increase thermionic emission | - |
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| thoriated | (adjective) being or sounding of nervous or suppressed laughter | Synonyms: tittering |
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| thorite | (noun) a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite | - |
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| thorium | (noun) a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands | Synonyms: atomic number 90, Th |
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| thorn | (noun) something that causes irritation and annoyance | Synonyms: irritant |
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| (noun) a Germanic character of runic origin | - |
| (noun) a small sharp-pointed tip resembling a spike on a stem or leaf | Synonyms: pricker, prickle, spikelet, spine, sticker |
| thornbill | (noun) any of various South American hummingbirds with a sharp pointed bill | - |
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| thorniness | (noun) the quality of being covered with prickly thorns or spines | Synonyms: bristliness, prickliness, spininess |
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| (noun) a rough and bitter manner | Synonyms: acerbity, acrimony, bitterness, jaundice, tartness |
| (noun) The property of being full of difficulties, complexities, or controversial points. | - |
| thornless | (adjective) lacking thorns | Synonyms: spineless |
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| thorny | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbed, barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setaceous, setose, spiny |
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| (adjective) bristling with perplexities | - |
| thorough | (adjective) painstakingly careful and accurate | - |
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| (adjective) performed comprehensively and completely; not superficial or partial | Synonyms: exhaustive, thoroughgoing |
| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thoroughgoing, unadulterated, utter |
| thoroughbred | (adjective) having a list of ancestors as proof of being a purebred animal | Synonyms: pedigree, pedigreed, pureblood, pureblooded |
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| (noun) a pedigreed animal of unmixed lineage; used especially of horses | Synonyms: pureblood, purebred |
| (noun) a racehorse belonging to a breed that originated from a cross between Arabian stallions and English mares | - |
| (noun) a well-bred person | - |
| thoroughfare | (noun) a public road from one place to another | - |
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| thoroughgoing | (adjective) performed comprehensively and completely; not superficial or partial | Synonyms: exhaustive, thorough |
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| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, unadulterated, utter |
| thoroughly | (adverb) in an exhaustive manner | Synonyms: exhaustively |
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| (adverb) completely and absolutely (`good' is sometimes used informally for `thoroughly') | Synonyms: good, soundly |
| thoroughness | (noun) conscientiousness in performing all aspects of a task | - |
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| (noun) property of being marked by full detail, complete in all respects. | - |
| thoroughwort | (noun) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine | Synonyms: agueweed, boneset, Eupatorium perfoliatum |
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| thortveitite | (noun) a mineral consisting of scandium yttrium silicate; a source of scandium | - |
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| unauthorised | (adjective) not endowed with authority | Synonyms: unauthorized |
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| (adjective) without official authorization | Synonyms: unauthorized, wildcat |
| unauthorized | (adjective) not endowed with authority | Synonyms: unauthorised |
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| (adjective) without official authorization | Synonyms: unauthorised, wildcat |
| whitethorn | (noun) thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America | Synonyms: Crataegus laevigata, Crataegus oxycantha, English hawthorn, may |
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