| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| authoritarian | (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
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| 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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| 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 | - |
| autoimmunity | (noun) production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions | - |
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| availability | (noun) the quality of being at hand when needed | Synonyms: accessibility, availableness, handiness |
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| avaritia | (noun) reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins) | Synonyms: avarice, covetousness, greed, rapacity |
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| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| azurite | (noun) blue carbonate of copper; blue malachite | - |
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| babbitt | (noun) an alloy of tin with some copper and antimony; a lining for bearings that reduces friction | Synonyms: Babbitt metal |
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| babbitting | (noun) lining a surface or bearing with Babbitt metal | - |
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| babysitter | (noun) a person engaged to care for children when the parents are not home | Synonyms: baby-sitter, sitter |
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| babysitting | (noun) the work of a baby sitter; caring for children when their parents are not home | Synonyms: baby sitting |
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| bacitracin | (noun) a polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally | - |
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| backbiter | (noun) one who attacks the reputation of another by slander or libel | Synonyms: defamer, libeler, maligner, slanderer, traducer, vilifier |
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| backstitch | (noun) an overlapping stitch made by starting the next stitch at the middle of the preceding one | - |
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| baddeleyite | (noun) a mineral consisting of zirconium oxide | - |
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| bait | (noun) something used to lure fish or other animals into danger so they can be trapped or killed | Synonyms: decoy, lure |
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| (noun) anything that serves as an enticement | Synonyms: come-on, hook, lure, sweetener |
| baiting | (noun) harassment especially of a tethered animal | - |
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| balanitis | (noun) inflammation of the head of the penis | - |
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| balanoposthitis | (noun) inflammation of both the head of the penis and the foreskin | - |
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| banality | (noun) a trite or obvious remark | Synonyms: bromide, cliche, commonplace, platitude |
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| bandit | (noun) an armed thief who is (usually) a member of a band | Synonyms: brigand |
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| banditry | (noun) the practice of plundering in gangs | - |
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| barbarity | (noun) a brutal barbarous savage act | Synonyms: barbarism, brutality, savagery |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarousness, heinousness |
| barbital | (noun) a barbiturate used as a hypnotic | Synonyms: barbitone, diethylbarbituric acid, diethylmalonylurea, veronal |
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| barbitone | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, diethylbarbituric acid, diethylmalonylurea, veronal |
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| barbiturate | (noun) organic compound having powerful soporific effect; overdose can be fatal | - |
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| barite | (noun) a white or colorless mineral (BaSO4); the main source of barium | Synonyms: barium sulphate, barytes, heavy spar |
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| baritone | (noun) the second lowest brass wind instrument | Synonyms: baritone horn |
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| (noun) the second lowest adult male singing voice | Synonyms: baritone voice |
| (noun) a male singer | Synonyms: barytone |
| bastnaesite | (noun) a yellow-to-brown mineral that is a source of rare earth elements | Synonyms: bastnasite |
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| bastnasite | (noun) a yellow-to-brown mineral that is a source of rare earth elements | Synonyms: bastnaesite |
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| batholite | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholith, pluton, plutonic rock |
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| batholith | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholite, pluton, plutonic rock |
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| bauxite | (noun) a clay-like mineral; the chief ore of aluminum; composed of aluminum oxides and aluminum hydroxides; used as an abrasive and catalyst | - |
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| beatitude | (noun) a state of supreme happiness | Synonyms: beatification, blessedness |
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| bedlamite | (noun) an archaic term for a lunatic | - |
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| bedsit | (noun) a furnished sitting room with sleeping accommodations (and some plumbing) | Synonyms: bedsitter, bedsitting room |
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| bedsitter | (noun) a furnished sitting room with sleeping accommodations (and some plumbing) | Synonyms: bedsit, bedsitting room |
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| belemnite | (noun) a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae | - |
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| believability | (noun) the quality of being believable or trustworthy | Synonyms: credibility, credibleness |
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| belittlement | (noun) the act of making a person or a thing seem little or unimportant. | - |
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| belittling | (noun) the act of belittling | - |
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| (noun) a belittling comment | Synonyms: denigration |
| bellicosity | (noun) a natural disposition to fight | Synonyms: bellicoseness |
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| bendability | (noun) the property of being easily bent without breaking | Synonyms: pliability |
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| benefit | (noun) something that aids or promotes well-being | Synonyms: welfare |
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| (noun) a performance to raise money for a charitable cause | - |
| (noun) financial assistance in time of need | - |
| benignity | (noun) a kind act | Synonyms: kindness |
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| (noun) the quality of being kind and gentle | Synonyms: benignancy, graciousness |
| bentonite | (noun) an absorbent aluminum silicate clay formed from volcanic ash | - |
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| bestiality | (noun) sexual activity between a person and an animal | Synonyms: sodomy, zooerastia, zooerasty |
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| (noun) the stupid brutal quality of a beast | - |
| bewitchery | (noun) magnetic personal charm | Synonyms: animal magnetism, beguilement |
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| bewitchment | (noun) a magical spell | Synonyms: enchantment |
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| bilaterality | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilateralism |
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| biodiversity | (noun) the diversity of plant and animal life in a particular habitat (or in the world as a whole) | - |
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| bioelectricity | (noun) electric phenomena in animals or plants | - |
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| biotite | (noun) dark brown to black mica found in igneous and metamorphic rock | - |
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| biscuit | (noun) small round bread leavened with baking-powder or soda | - |
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| (noun) any of various small flat sweet cakes | Synonyms: cookie, cooky |
| bisexuality | (noun) sexual activity with both men and women | - |
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| (noun) showing characteristics of both sexes | Synonyms: androgyny, hermaphroditism |
| bit | (noun) the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press | - |
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| (noun) piece of metal held in horse's mouth by reins and used to control the horse while riding | - |
| (noun) the part of a key that enters a lock and lifts the tumblers | - |
| (noun) a short performance that is part of a longer program | Synonyms: act, number, routine, turn |
| (noun) a small fragment | Synonyms: snatch |
| (noun) an instance of some kind | Synonyms: piece |
| (noun) a small amount of solid food; a mouthful | Synonyms: bite, morsel |
| (noun) a small fragment of something broken off from the whole | Synonyms: chip, flake, fleck, scrap |
| (noun) a unit of measurement of information (from binary + digit); the amount of information in a system having two equiprobable states | - |
| (noun) a small piece or quantity of something | Synonyms: spot |
| (noun) an indefinitely short time | Synonyms: minute, mo, moment, second |
| bitartrate | (noun) an acid tartrate; a hydrogen tartrate | - |
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| bitch | (noun) female of any member of the dog family | - |
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| (noun) informal terms for objecting | Synonyms: beef, gripe, kick, squawk |
| (noun) a person (usually but not necessarily a woman) who is thoroughly disliked | Synonyms: cunt |
| (noun) an unpleasant difficulty | - |
| bitchery | (noun) aggressive remarks and behavior like that of a spiteful malicious woman | - |
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| bitchiness | (noun) malevolence by virtue of being malicious or spiteful or nasty | Synonyms: cattiness, nastiness, spite, spitefulness |
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| bite | (noun) the act of gripping or chewing off with the teeth and jaws | Synonyms: chomp |
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| (noun) a portion removed from the whole | - |
| (noun) a strong odor or taste property | Synonyms: pungency, raciness, sharpness |
| (noun) wit having a sharp and caustic quality | Synonyms: pungency |
| (noun) (angling) an instance of a fish taking the bait | - |
| (noun) a light informal meal | Synonyms: collation, snack |
| (noun) a small amount of solid food; a mouthful | Synonyms: bit, morsel |
| (noun) a wound resulting from biting by an animal or a person | - |
| (noun) a painful wound caused by the thrust of an insect's stinger into skin | Synonyms: insect bite, sting |
| biteplate | (noun) a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes | Synonyms: bite plate |
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| biter | (noun) someone who bites | - |
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| bitewing | (noun) a dental X-ray film that can be held in place by the teeth during radiography | - |
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| bitmap | (noun) an image represented as a two dimensional array of brightness values for pixels | Synonyms: electronic image |
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| bitok | (noun) a Russian dish made with patties of ground meat (mixed with onions and bread and milk) and served with a sauce of sour cream | - |
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| bitstock | (noun) a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring | Synonyms: brace |
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| bitt | (noun) a strong post (as on a wharf or quay or ship for attaching mooring lines) | Synonyms: bollard |
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| bitter | (noun) the property of having a harsh unpleasant taste | Synonyms: bitterness |
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| (noun) the taste experience when quinine or coffee is taken into the mouth | Synonyms: bitterness |
| (noun) English term for a dry sharp-tasting ale with strong flavor of hops (usually on draft) | - |
| bittercress | (noun) any of various herbs of the genus Cardamine, having usually pinnate leaves and racemes of white, pink or purple flowers; cosmopolitan except Antarctic | Synonyms: bitter cress |
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| bittern | (noun) relatively small compact tawny-brown heron with nocturnal habits and a booming cry; found in marshes | - |
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| bitterness | (noun) the property of having a harsh unpleasant taste | Synonyms: bitter |
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| (noun) a rough and bitter manner | Synonyms: acerbity, acrimony, jaundice, tartness, thorniness |
| (noun) the taste experience when quinine or coffee is taken into the mouth | Synonyms: bitter |
| (noun) a feeling of deep and bitter anger and ill-will | Synonyms: gall, rancor, rancour, resentment |
| bitternut | (noun) hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts | Synonyms: bitter hickory, bitter pignut, bitternut hickory, Carya cordiformis, swamp hickory |
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| bitterroot | (noun) showy succulent ground-hugging plant of Rocky Mountains regions having deep to pale pink flowers and fleshy farinaceous roots; the Montana state flower | Synonyms: Lewisia rediviva |
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| bitters | (noun) alcoholic liquor flavored with bitter herbs and roots | - |
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| bittersweet | (noun) twining shrub of North America having yellow capsules enclosing scarlet seeds | Synonyms: American bittersweet, Celastrus scandens, climbing bittersweet, false bittersweet, shrubby bittersweet, staff vine, waxwork |
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| (noun) poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America | Synonyms: bittersweet nightshade, climbing nightshade, deadly nightshade, poisonous nightshade, Solanum dulcamara, woody nightshade |
| bitterweed | (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: ambrosia, ragweed |
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| (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bristly oxtongue, bugloss, oxtongue, Picris echioides |
| bitterwood | (noun) handsome South American shrub or small tree having bright scarlet flowers and yielding a valuable fine-grained yellowish wood; yields the bitter drug quassia from its wood and bark | Synonyms: quassia, Quassia amara |
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| (noun) West Indian tree yielding the drug Jamaica quassia | Synonyms: Jamaica quassia, Picrasma excelsa, Picrasma excelsum |
| (noun) medium to large tree of tropical North and South America having odd-pinnate leaves and long panicles of small pale yellow flowers followed by scarlet fruits | Synonyms: paradise tree, Simarouba glauca |
| bitthead | (noun) the upper end of a bitt | - |
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| bitumastic | (noun) a protective coating of asphalt and filter used on structural metals that are exposed to weathering | - |
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| bitumen | (noun) any of various naturally occurring impure mixtures of hydrocarbons | - |
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| blacksmith | (noun) a smith who forges and shapes iron with a hammer and anvil | - |
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| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| blaxploitation | (noun) the exploitation of black people (especially with regard to stereotyped roles in movies) | - |
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| blepharitis | (noun) inflammation of the eyelids characterized by redness and swelling and dried crusts | - |
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| blewits | (noun) edible agaric that is pale lilac when young; has a smooth moist cap | Synonyms: Clitocybe nuda |
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| blitheness | (noun) a feeling of spontaneous good spirits | Synonyms: cheerfulness |
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| blitz | (noun) a swift and violent military offensive with intensive aerial bombardment | Synonyms: blitzkrieg |
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| (noun) (American football) defensive players try to break through the offensive line | Synonyms: linebacker blitzing, safety blitz |
| blitzkrieg | (noun) a swift and violent military offensive with intensive aerial bombardment | Synonyms: blitz |
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| bobwhite | (noun) a popular North American game bird; named for its call | Synonyms: bobwhite quail, partridge |
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| boilersuit | (noun) a loose protective coverall or smock worn over ordinary clothing for dirty work | Synonyms: boilers suit, overall |
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| bonito | (noun) any of various scombroid fishes intermediate in size and characteristics between mackerels and tunas | - |
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| (noun) fish whose flesh is dried and flaked for Japanese cookery; may be same species as skipjack tuna | Synonyms: Katsuwonus pelamis, oceanic bonito |
| (noun) flesh of mostly Pacific food fishes of the genus Sarda of the family Scombridae; related to but smaller than tuna | - |
| bornite | (noun) a mineral consisting of sulfides of copper and iron that is found in copper deposits | Synonyms: peacock ore |
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| bowsprit | (noun) a spar projecting from the bow of a vessel | - |
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| breadfruit | (noun) a large round seedless or seeded fruit with a texture like bread; eaten boiled or baked or roasted or ground into flour; the roasted seeds resemble chestnuts | - |
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| (noun) native to Pacific islands and having edible fruit with a texture like bread | Synonyms: Artocarpus altilis, Artocarpus communis, breadfruit tree |