| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| abreaction | (noun) (psychoanalysis) purging of emotional tensions | Synonyms: catharsis, katharsis |
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| abstraction | (noun) a general concept formed by extracting common features from specific examples | Synonyms: abstract entity |
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| (noun) the act of withdrawing or removing something | - |
| (noun) an abstract painting | - |
| (noun) a concept or idea not associated with any specific instance | Synonyms: abstract |
| (noun) preoccupation with something to the exclusion of all else | Synonyms: abstractedness |
| (noun) the process of formulating general concepts by abstracting common properties of instances | Synonyms: generalisation, generalization |
| abstractionism | (noun) an abstract genre of art; artistic content depends on internal form rather than pictorial representation | Synonyms: abstract art |
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| (noun) a representation having no reference to concrete objects or specific examples | Synonyms: unrealism |
| abstractionist | (adjective) not representing or imitating external reality or the objects of nature | Synonyms: abstract, nonfigurative, nonobjective |
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| (noun) a painter of abstract pictures | Synonyms: abstract artist |
| abstractive | (adjective) of an abstracting nature or having the power of abstracting | - |
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| actin | (noun) one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| acting | (adjective) serving temporarily especially as a substitute | - |
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| (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| actinian | (noun) any sea anemone or related animal | Synonyms: actinia, actiniarian |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| actinism | (noun) the property of radiation that enables it to produce photochemical effects | - |
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| actinium | (noun) a radioactive element of the actinide series; found in uranium ores | Synonyms: Ac, atomic number 89 |
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| actinoid | (adjective) having a radial form | - |
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| (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomorphous | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphic |
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| actinomyces | (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites | - |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| actinomycin | (noun) any of various red antibiotics isolated from soil bacteria | - |
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| actinomycosis | (noun) disease of cattle that can be transmitted to humans; results from infection with actinomycetes; characterized by hard swellings that exude pus through long sinuses | - |
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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| actinon | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinoid |
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| actinopod | (noun) protozoa having stiff rodlike radiating pseudopods | - |
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| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| actinozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: anthozoan |
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| action | (noun) the most important or interesting work or activity in a specific area or field | - |
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| (noun) a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong | Synonyms: action at law, legal action |
| (noun) something done (usually as opposed to something said) | - |
| (noun) a military engagement | Synonyms: military action |
| (noun) an act by a government body or supranational organization | - |
| (noun) the operating part that transmits power to a mechanism | Synonyms: action mechanism |
| (noun) In firearms terminology, the mechanism that handles the ammunition (loads, locks, fires, and extracts the cartridges). | - |
| (noun) the trait of being active and energetic and forceful | - |
| (noun) the series of events that form a plot | - |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: activity, natural action, natural process |
| (noun) the state of being active | Synonyms: activeness, activity |
| (verb) put in effect | Synonyms: accomplish, carry out, carry through, execute, fulfil, fulfill |
| (verb) institute legal proceedings against; file a suit against | Synonyms: litigate, process, sue |
| actionable | (adjective) affording grounds for legal action | - |
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| activate | (verb) make active or more active | - |
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| (verb) make (substances) radioactive | - |
| (verb) aerate (sewage) so as to favor the growth of organisms that decompose organic matter | Synonyms: aerate |
| (verb) make more adsorptive | - |
| (verb) put in motion or move to act | Synonyms: actuate, set off, spark, spark off, touch off, trigger, trigger off, trip |
| activated | (adjective) rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive | - |
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| (adjective) (military) set up and placed on active assignment | - |
| (adjective) (of e.g. a molecule) made reactive or more reactive | Synonyms: excited |
| (adjective) (of sewage) treated with aeration and bacteria to aid decomposition | - |
| activating | (adjective) causing motion or action or change | Synonyms: actuating |
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| (noun) the activity of causing to have energy and be active | Synonyms: activation, energizing |
| activation | (noun) the activity of causing to have energy and be active | Synonyms: activating, energizing |
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| (noun) making active and effective (as a bomb) | - |
| (noun) stimulation of activity in an organism or chemical | - |
| activator | (noun) (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription | - |
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| active | (adjective) (used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being | Synonyms: dynamic |
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| (adjective) characterized by energetic activity | - |
| (adjective) tending to become more severe or wider in scope | - |
| (adjective) disposed to take action or effectuate change | - |
| (adjective) (of e.g. volcanoes) erupting or liable to erupt | - |
| (adjective) (of e.g. volcanoes) capable of erupting | - |
| (adjective) full of activity or engaged in continuous activity | - |
| (adjective) exerting influence or producing a change or effect | - |
| (adjective) engaged in full-time work | - |
| (adjective) expressing that the subject of the sentence has the semantic function of actor: | - |
| (adjective) (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions | - |
| (adjective) in operation | Synonyms: alive |
| (adjective) taking part in an activity | Synonyms: participating |
| (adjective) engaged in or ready for military or naval operations | Synonyms: combat-ready, fighting |
| (noun) a person who is a participating member of an organization | - |
| (noun) the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb | Synonyms: active voice |
| (noun) chemical agent capable of activity | Synonyms: active agent |
| actively | (adverb) in an active manner | - |
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| activeness | (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activity |
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| (noun) the state of being active | Synonyms: action, activity |
| activewear | (noun) attire worn for sport or for casual wear | Synonyms: athletic wear, sportswear |
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| activism | (noun) a policy of taking direct action to achieve a political or social goal | - |
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| activist | (adjective) advocating or engaged in activism | Synonyms: activistic |
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| (noun) a militant reformer | Synonyms: militant |
| activistic | (adjective) advocating or engaged in activism | Synonyms: activist |
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| activity | (noun) any specific behavior | - |
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| (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activeness |
| (noun) an organic process that takes place in the body | Synonyms: bodily function, bodily process, body process |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: action, natural action, natural process |
| (noun) the state of being active | Synonyms: action, activeness |
| (noun) (chemistry) the capacity of a substance to take part in a chemical reaction | - |
| agalactia | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactosis |
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| anaphylactic | (adjective) related to the hypersensitivity known as anaphylaxis | - |
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| anticlimactic | (adjective) coming after the climax especially of a dramatic or narrative plot | - |
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| (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactical |
| anticlimactical | (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactic |
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| apractic | (adjective) having uncoordinated muscular movements, symptomatic of a CNS disorder | Synonyms: apraxic |
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| atactic | (adjective) lacking motor coordination; marked or caused by ataxia | Synonyms: ataxic |
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| ataractic | (adjective) tending to soothe or tranquilize | Synonyms: ataraxic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic agent, ataractic drug, tranquilizer, tranquilliser, tranquillizer |
| attraction | (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attractiveness |
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| (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attractive feature, attractor, magnet |
| (noun) an entertainment that is offered to the public | - |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attractor, draw, drawing card |
| (noun) the force by which one object attracts another | Synonyms: attractive force |
| attractive | (adjective) pleasing to the eye or mind especially through beauty or charm | - |
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| (adjective) having the properties of a magnet; the ability to draw or pull | - |
| (adjective) having power to arouse interest | - |
| attractively | (adverb) in a beautiful manner | Synonyms: beautifully |
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| attractiveness | (noun) sexual allure | - |
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| (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attraction |
| autodidactic | (adjective) relating to or having the characteristics of an autodidact | - |
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| benefaction | (noun) an act intending or showing kindness and good will | Synonyms: benevolence |
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| (noun) a contribution of money or assistance | - |
| calefaction | (noun) the property of being warming | Synonyms: incalescence |
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| calefactive | (adjective) serving to heat | Synonyms: calefactory |
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| chaenactis | (noun) any of several United States plants having long stalks of funnel-shaped white or yellow flowers | - |
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| chiropractic | (noun) a method of treatment that manipulates body structures (especially the spine) to relieve low back pain or even headache or high blood pressure | - |
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| chylifactive | (adjective) producing or converting into chyle | Synonyms: chylifactory, chylific |
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| climactic | (adjective) consisting of or causing a climax | - |
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| coaction | (noun) act of working jointly | Synonyms: collaboration |
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| compaction | (noun) the act of crushing | Synonyms: crunch, crush |
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| (noun) an increase in the density of something | Synonyms: compression, concretion, densification |
| contractile | (adjective) capable of contracting or being contracted | - |
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| contractility | (noun) the capability or quality of shrinking or contracting, especially by muscle fibers and even some other forms of living matter | - |
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| contracting | (noun) becoming infected | Synonyms: catching |
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| contraction | (noun) the act of decreasing (something) in size or volume or quantity or scope | - |
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| (noun) (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber) | Synonyms: muscle contraction, muscular contraction |
| (noun) a word formed from two or more words by omitting or combining some sounds | - |
| (noun) the process or result of becoming smaller or pressed together | Synonyms: compression, condensation |
| counteraction | (noun) action intended to nullify the effects of some previous action | Synonyms: neutralisation, neutralization |
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| counteractive | (adjective) opposing or neutralizing or mitigating an effect by contrary action | - |
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| counteractively | (adverb) in a counteractive manner | - |
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| counterattraction | (noun) a rival attraction | - |
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| deactivate | (verb) make inactive | Synonyms: inactivate |
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| (verb) remove from active military status or reassign | - |
| deactivation | (noun) the act of deactivating or making ineffective (as a bomb) | Synonyms: defusing |
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| (noun) breaking up a military unit (by transfers or discharges) | Synonyms: inactivation |
| detraction | (noun) the act of discrediting or detracting from someone's reputation (especially by slander) | - |
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| (noun) a petty disparagement | Synonyms: petty criticism |
| detractive | (adjective) causing to decrease in importance or value | - |
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| didactic | (adjective) instructive (especially excessively) | Synonyms: didactical |
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| didactical | (adjective) instructive (especially excessively) | Synonyms: didactic |
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| didactically | (adverb) in a didactic manner | Synonyms: pedagogically |
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| didacticism | (noun) communication that is suitable for or intended to be instructive | - |
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| didactics | (noun) the activities of educating or instructing; activities that impart knowledge or skill | Synonyms: education, educational activity, instruction, pedagogy, teaching |
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| diffraction | (noun) when light passes sharp edges or goes through narrow slits the rays are deflected and produce fringes of light and dark bands | - |
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| dissatisfaction | (noun) the feeling of being displeased and discontent | - |
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| distraction | (noun) an entertainment that provokes pleased interest and distracts you from worries and vexations | Synonyms: beguilement |
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| (noun) the act of distracting; drawing someone's attention away from something | Synonyms: misdirection |
| (noun) mental turmoil | - |
| (noun) an obstacle to attention | - |
| exacting | (adjective) having complicated nutritional requirements; especially growing only in special artificial cultures | Synonyms: fastidious |
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| (adjective) requiring precise accuracy | Synonyms: exigent |
| (adjective) severe and unremitting in making demands | Synonyms: stern, strict |
| exactingness | (noun) the quality or state of being demanding or unyielding. | - |
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| exaction | (noun) act of demanding or levying by force or authority | - |
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| exactitude | (noun) the quality of being exact | Synonyms: exactness |
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| extractible | (adjective) capable of being extracted | Synonyms: extractable |
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| extraction | (noun) the action of taking out something (especially using effort or force) | - |
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| (noun) properties attributable to your ancestry | Synonyms: descent, origin |
| (noun) the process of obtaining something from a mixture or compound by chemical or physical or mechanical means | - |
| extractivity | (noun) the amount of extract that grains of malt yield. | - |
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| extragalactic | (adjective) outside or beyond a galaxy | - |
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