| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| ammeter | (noun) a meter that measures the flow of electrical current in amperes | - |
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| amusement | (noun) an activity that is diverting and that holds the attention | Synonyms: entertainment |
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| (noun) a feeling of delight at being entertained | - |
| andromeda | (noun) any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers | - |
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| (noun) broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers | Synonyms: Japanese andromeda, lily-of-the-valley tree, Pieris japonica |
| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| anemometer | (noun) a gauge for recording the speed and direction of wind | Synonyms: wind gage, wind gauge |
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| anemometry | (noun) measuring wind speed and direction | - |
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| anime | (noun) a style of animation developed in Japan, characterized by stylized colorful art and often adult themes | - |
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| (noun) a hard copal derived from an African tree | Synonyms: Zanzibar copal |
| (noun) any of various resins or oleoresins | Synonyms: gum anime |
| anisogamete | (noun) either of a pair of unlike gametes especially those unlike in size | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| announcement | (noun) a public statement containing information about an event that has happened or is going to happen | Synonyms: promulgation |
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| (noun) a formal public statement | Synonyms: annunciation, declaration, proclamation |
| annulment | (noun) (law) a formal termination (of a relationship or a judicial proceeding etc) | Synonyms: invalidation |
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| (noun) the act of abrogating; an official or legal cancellation | Synonyms: abrogation, repeal |
| (noun) the state of being cancelled or annulled | Synonyms: revocation |
| anointment | (noun) the act of applying oil or an oily liquid | Synonyms: anointing |
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| anthropometry | (noun) measurement and study of the human body and its parts and capacities | - |
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| antiemetic | (noun) a drug that prevents or alleviates nausea and vomiting | Synonyms: antiemetic drug |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| antimeson | (noun) the antiparticle of a meson | - |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| antimetathesis | (noun) A rhetorical figure resulting from a reverted arrangement in the last clause of a sentence of the two principal words of the clause preceding; inversion of the members of an antithesis: as, "A poem is a speaking picture; a picture a mute poem". | - |
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| apartment | (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: flat |
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| apodeme | (noun) ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles | - |
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| apoenzyme | (noun) a protein that combines with a coenzyme to form an active enzyme | - |
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| appeasement | (noun) the act of appeasing (as by acceding to the demands of) | Synonyms: calming |
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| appointment | (noun) the act of putting a person into a non-elective position | Synonyms: assignment, designation, naming |
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| (noun) the job to which you are (or hope to be) appointed | - |
| (noun) (law) the act of disposing of property by virtue of the power of appointment | - |
| (noun) (usually in the plural) furnishings and equipment (especially for a ship or hotel) | Synonyms: fitting |
| (noun) a meeting arranged in advance | Synonyms: date, engagement |
| (noun) a person who is appointed to a job or position | Synonyms: appointee |
| apportionment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportioning, assignation, parceling, parcelling |
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| arame | (noun) an edible seaweed with a mild flavor | - |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrement | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitration |
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| argument | (noun) a variable in a logical or mathematical expression whose value determines the dependent variable; if f(x)=y, x is the independent variable | - |
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| (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argumentation, line, line of reasoning, logical argument |
| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argumentation, debate |
| (noun) a summary of the subject or plot of a literary work or play or movie | Synonyms: literary argument |
| (noun) a fact or assertion offered as evidence that something is true | Synonyms: statement |
| (noun) a contentious speech act; a dispute where there is strong disagreement | Synonyms: arguing, contention, contestation, controversy, disceptation, disputation, tilt |
| (noun) (computer science) a reference or value that is passed to a function, procedure, subroutine, command, or program | Synonyms: parameter |
| argumentation | (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argument, line, line of reasoning, logical argument |
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| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argument, debate |
| arithmetic | (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| armament | (noun) the act of equipping with weapons in preparation for war | Synonyms: arming, equipping |
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| (noun) weaponry used by military or naval force | - |
| armamentarium | (noun) the collection of equipment and methods used in the practice of medicine | - |
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| armet | (noun) a medieval helmet with a visor and a neck guard | - |
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| arraignment | (noun) a legal document calling someone to court to answer an indictment | - |
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| arrangement | (noun) the act of arranging and adapting a piece of music | Synonyms: arranging, transcription |
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| (noun) the spatial property of the way in which something is placed | Synonyms: placement |
| (noun) an organized structure for arranging or classifying | Synonyms: organisation, organization, system |
| (noun) the thing arranged or agreed to | Synonyms: agreement |
| (noun) a piece of music that has been adapted for performance by a particular set of voices or instruments | Synonyms: musical arrangement |
| (noun) an orderly grouping (of things or persons) considered as a unit; the result of arranging | - |
| arthromere | (noun) any of the segments in the body of a jointed animal like an arthropod | - |
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| aspartame | (noun) an artificial sweetener made from aspartic acid; used as a calorie-free sweetener | - |
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| assessment | (noun) the act of judging or assessing a person or situation or event | Synonyms: judgement, judgment |
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| (noun) the market value set on assets | - |
| (noun) the classification of someone or something with respect to its worth | Synonyms: appraisal |
| (noun) an amount determined as payable | - |
| assignment | (noun) a duty that you are assigned to perform (especially in the armed forces) | Synonyms: duty assignment |
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| (noun) the act of putting a person into a non-elective position | Synonyms: appointment, designation, naming |
| (noun) the act of distributing something to designated places or persons | Synonyms: assigning |
| (noun) an undertaking that you have been assigned to do (as by an instructor) | - |
| (noun) the instrument by which a claim or right or interest or property is transferred from one person to another | - |
| (noun) (law) a transfer of property by deed of conveyance | Synonyms: grant |
| assortment | (noun) the act of distributing things into classes or categories of the same type | Synonyms: categorisation, categorization, classification, compartmentalisation, compartmentalization |
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| (noun) a collection containing a variety of sorts of things | Synonyms: miscellanea, miscellany, mixed bag, mixture, motley, potpourri, salmagundi, smorgasbord, variety |
| assuagement | (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: alleviation, relief |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astrodome | (noun) a transparent dome on top of an airplane where the navigator can make celestial observations | - |
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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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| asymmetry | (noun) (mathematics) a lack of symmetry | - |
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| atmometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: evaporometer |
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| atonement | (noun) the act of atoning for sin or wrongdoing (especially appeasing a deity) | Synonyms: expiation, propitiation |
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| (noun) compensation for a wrong | Synonyms: expiation, satisfaction |
| attachment | (noun) the act of fastening things together | Synonyms: fastening |
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| (noun) the act of attaching or affixing something | Synonyms: affixation |
| (noun) faithful support for a cause or political party or religion | Synonyms: adherence, adhesion |
| (noun) a supplementary part or accessory | - |
| (noun) a connection that fastens things together | Synonyms: bond |
| (noun) a writ authorizing the seizure of property that may be needed for the payment of a judgment in a judicial proceeding | - |
| (noun) a feeling of affection for a person or an institution | Synonyms: fond regard |
| attainment | (noun) the act of achieving an aim | - |
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| (noun) arrival at a new stage | - |
| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, acquisition, skill |
| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| augmentation | (noun) the act of augmenting | - |
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| (noun) the statement of a theme in notes of greater duration (usually twice the length of the original) | - |
| (noun) the amount by which something becomes greater | - |
| autosome | (noun) any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa | Synonyms: somatic chromosome |
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| averment | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, asseveration |
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| avouchment | (noun) a statement asserting the existence or the truth of something | Synonyms: affirmation, avowal |
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| backswimmer | (noun) predaceous aquatic insect that swims on its back and may inflict painful bites | Synonyms: Notonecta undulata |
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| bafflement | (noun) confusion resulting from failure to understand | Synonyms: befuddlement, bemusement, bewilderment, mystification, obfuscation, puzzlement |
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| bailment | (noun) the delivery of personal property in trust by the bailor to the bailee | - |
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| ballgame | (noun) a field game played with a ball (especially baseball) | Synonyms: ball game |
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| (noun) a particular situation that is radically different from the preceding situation | Synonyms: new ballgame |
| ballottement | (noun) a palpatory technique for feeling a floating object in the body (especially for determining the position of a fetus by feeling the rebound of the fetus after a quick digital tap on the wall of the uterus) | - |
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| banishment | (noun) rejection by means of an act of banishing or proscribing someone | Synonyms: proscription |
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| (noun) the state of being banished or ostracized (excluded from society by general consent) | Synonyms: Coventry, ostracism |
| barnstormer | (noun) a pilot who travels around the country giving exhibits of stunt flying and parachuting | Synonyms: stunt flier, stunt pilot |
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| (noun) an actor who travels around the country presenting plays | Synonyms: play-actor, playactor, trouper |
| barometer | (noun) an instrument that measures atmospheric pressure | - |
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| basement | (noun) the lowermost portion of a structure partly or wholly below ground level; often used for storage | Synonyms: cellar |
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| (noun) the ground floor facade or interior in Renaissance architecture | - |
| bathometer | (noun) an instrument that measures the depth of water | Synonyms: bathymeter |
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| bathymeter | (noun) an instrument that measures the depth of water | Synonyms: bathometer |
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| bathymetry | (noun) measuring the depths of the oceans | Synonyms: plumbing |
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| battlement | (noun) a rampart built around the top of a castle with regular gaps for firing arrows or guns | Synonyms: crenelation, crenellation |
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| bechamel | (noun) milk thickened with a butter and flour roux | Synonyms: bechamel sauce, white sauce |
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| bedevilment | (noun) the act of harassing someone | Synonyms: badgering, torment, worrying |
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| bedframe | (noun) the framework of a bed | Synonyms: bedstead |
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| bedtime | (noun) the time you go to bed | - |
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| befoulment | (noun) the state of being polluted | Synonyms: defilement, pollution |
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| befuddlement | (noun) confusion resulting from failure to understand | Synonyms: bafflement, bemusement, bewilderment, mystification, obfuscation, puzzlement |
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| beguilement | (noun) an entertainment that provokes pleased interest and distracts you from worries and vexations | Synonyms: distraction |
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| (noun) magnetic personal charm | Synonyms: animal magnetism, bewitchery |
| beldame | (noun) a woman of advanced age | Synonyms: beldam |
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| (noun) an ugly evil-looking old woman | Synonyms: beldam, crone, hag, witch |
| belittlement | (noun) the act of making a person or a thing seem little or unimportant. | - |
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| bemusement | (noun) confusion resulting from failure to understand | Synonyms: bafflement, befuddlement, bewilderment, mystification, obfuscation, puzzlement |
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| bereavement | (noun) state of sorrow over the death or departure of a loved one | Synonyms: mourning |
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| bestowment | (noun) the act of conferring an honor or presenting a gift | Synonyms: bestowal, conferment, conferral |
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| (noun) a gift that is bestowed or conferred | Synonyms: bestowal |
| betterment | (noun) the act of relieving ills and changing for the better | Synonyms: amelioration, melioration |
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| (noun) a change for the better; progress in development | Synonyms: advance, improvement |
| (noun) an improvement that adds to the value of a property or facility | - |
| bewilderment | (noun) confusion resulting from failure to understand | Synonyms: bafflement, befuddlement, bemusement, mystification, obfuscation, puzzlement |
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| bewitchment | (noun) a magical spell | Synonyms: enchantment |
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| bimester | (noun) a period of 2 months | - |
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| bimetal | (noun) material made by bonding together sheets of two different metals | - |
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| bimetallism | (noun) a monetary standard under which the basic unit of currency is defined by stated amounts of two metals (usually gold and silver) with values set at a predetermined ratio | - |
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| bimetallist | (noun) an advocate of bimetallism | - |
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| biome | (noun) a major biotic community characterized by the dominant forms of plant life and the prevailing climate | - |
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| biomedicine | (noun) the branch of medical science that studies the ability of organisms to withstand environmental stress (as in space travel) | - |
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| (noun) the branch of medical science that applies biological and physiological principles to clinical practice | - |
| biometrics | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometry, biostatistics |
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| biometry | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometrics, biostatistics |
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| bioremediation | (noun) the act of treating waste or pollutants by the use of microorganisms (as bacteria) that can break down the undesirable substances | - |
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| (noun) the branch of biotechnology that uses biological process to overcome environmental problems | - |
| birdlime | (noun) a sticky adhesive that is smeared on small branches to capture small birds | Synonyms: lime |
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| bitumen | (noun) any of various naturally occurring impure mixtures of hydrocarbons | - |
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| blame | (noun) a reproach for some lapse or misdeed | Synonyms: rap |
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| (noun) an accusation that you are responsible for some lapse or misdeed | Synonyms: incrimination, inculpation |