| act | (noun) something that people do or cause to happen | Synonyms: deed, human action, human activity |
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| (noun) a subdivision of a play or opera or ballet | - |
| (noun) a legal document codifying the result of deliberations of a committee or society or legislative body | Synonyms: enactment |
| (noun) a short performance that is part of a longer program | Synonyms: bit, number, routine, turn |
| (noun) a manifestation of insincerity | - |
| (verb) behave in a certain manner; show a certain behavior; conduct or comport oneself | Synonyms: acquit, bear, behave, carry, comport, conduct, deport, do |
| (verb) pretend to have certain qualities or state of mind | Synonyms: act as, play |
| (verb) discharge one's duties | - |
| (verb) play a role or part | Synonyms: play, represent |
| (verb) perform on a stage or theater | Synonyms: play, playact, roleplay |
| (verb) behave unnaturally or affectedly | Synonyms: dissemble, pretend |
| (verb) perform an action, or work out or perform (an action) | Synonyms: move |
| (verb) have an effect or outcome; often the one desired or expected | Synonyms: work |
| (verb) be suitable for theatrical performance | - |
| actable | (adjective) capable of being acted; suitable for the stage | - |
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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 | - |
| actomyosin | (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions | - |
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| actor | (noun) a theatrical performer | Synonyms: histrion, player, role player, thespian |
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| (noun) a person who acts and gets things done | Synonyms: doer, worker |
| actress | (noun) a female actor | - |
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| actual | (adjective) presently existing in fact and not merely potential or possible | Synonyms: existent |
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| (adjective) being or existing at the present moment | - |
| (adjective) taking place in reality; not pretended or imitated | - |
| (adjective) being or reflecting the essential or genuine character of something | Synonyms: genuine, literal, real |
| (adjective) existing in act or fact | Synonyms: factual |
| actualisation | (noun) making real or giving the appearance of reality | Synonyms: actualization, realisation, realization |
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| actualise | (verb) represent or describe realistically | Synonyms: actualize |
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| (verb) make real or concrete; give reality or substance to | Synonyms: actualize, realise, realize, substantiate |
| actuality | (noun) the state of actually existing objectively | - |
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| actualization | (noun) making real or giving the appearance of reality | Synonyms: actualisation, realisation, realization |
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| actualize | (verb) represent or describe realistically | Synonyms: actualise |
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| (verb) make real or concrete; give reality or substance to | Synonyms: actualise, realise, realize, substantiate |
| actually | (adverb) used to imply that one would expect the fact to be the opposite of that stated; surprisingly | Synonyms: in reality |
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| (adverb) in actual fact | Synonyms: really |
| (adverb) as a sentence modifier to add slight emphasis; as a modifier to add slight emphasis | - |
| (adverb) at present | - |
| actuarial | (adjective) of or relating to the work of an actuary | - |
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| actuary | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: statistician |
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| actuate | (verb) put in motion or move to act | Synonyms: activate, set off, spark, spark off, touch off, trigger, trigger off, trip |
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| (verb) give an incentive for action | Synonyms: incite, motivate, move, prompt, propel |
| actuated | (adjective) moved to action | - |
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| actuating | (adjective) causing motion or action or change | Synonyms: activating |
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| actuation | (noun) the act of propelling | Synonyms: propulsion |
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| actuator | (noun) a mechanism that puts something into automatic action | - |
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