| 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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| acuate | (adjective) ending in a sharp point | Synonyms: acute, needlelike, sharp |
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| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| aculea | (noun) small spiny outgrowth on the wings of certain insects | - |
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| aculeate | (adjective) having or resembling a stinger or barb | Synonyms: aculeated |
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| aculeated | (adjective) having or resembling a stinger or barb | Synonyms: aculeate |
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| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| acumen | (noun) shrewdness shown by keen insight | Synonyms: insightfulness |
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| (noun) a tapering point | - |
| acuminate | (adjective) (of a leaf shape) narrowing to a slender point | - |
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| (verb) make sharp or acute; taper; make (something) come to a point | - |
| acupressure | (noun) treatment of symptoms by applying pressure with the fingers to specific pressure points on the body | Synonyms: G-Jo, shiatsu |
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| acupuncture | (noun) treatment of pain or disease by inserting the tips of needles at specific points on the skin | Synonyms: stylostixis |
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| acute | (adjective) having or experiencing a rapid onset and short but severe course | - |
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| (adjective) of an angle; less than 90 degrees | - |
| (adjective) of critical importance and consequence | - |
| (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp |
| (adjective) ending in a sharp point | Synonyms: acuate, needlelike, sharp |
| (adjective) extremely sharp or severe | Synonyms: intense |
| (noun) a mark placed above a vowel to indicate pronunciation | Synonyms: acute accent, ague |
| acutely | (adverb) having a rapid onset | - |
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| (adverb) in a keen or penetrating way | Synonyms: keenly |
| (adverb) changing suddenly in direction and degree | Synonyms: sharp, sharply |
| (adverb) in a shrewd manner | Synonyms: astutely, sagaciously, sapiently, shrewdly |
| acuteness | (noun) the quality of having a sharp edge or point | - |
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| (noun) a quick and penetrating intelligence | Synonyms: acuity, keenness, sharpness |
| (noun) a sensitivity that is keen and highly developed | - |
| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| acyclovir | (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms | Synonyms: Zovirax |
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| acyl | (noun) any group or radical of the form RCO- where R is an organic group | Synonyms: acyl group |
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| acylation | (noun) the process of introducing an acyl group into a compound | - |
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| acylglycerol | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: glyceride |
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| adactylia | (noun) congenital absence of fingers and/or toes | Synonyms: adactylism, adactyly |
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| adactylism | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactyly |
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| adactylous | (adjective) without fingers and/or toes | - |
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| adactyly | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactylism |
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| adamance | (noun) resoluteness by virtue of being unyielding and inflexible | Synonyms: obduracy, unyieldingness |
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| addict | (noun) someone who is physiologically dependent on a substance or activity | - |
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| (noun) someone who is so ardently devoted to something that it resembles an addiction | Synonyms: freak, junkie, junky, nut |
| (verb) to cause (someone or oneself) to become dependent (on something, especially a narcotic drug) | Synonyms: hook |
| addicted | (adjective) compulsively or physiologically dependent on something habit-forming | - |
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| addiction | (noun) (Roman law) a formal award by a magistrate of a thing or person to another person (as the award of a debtor to his creditor); a surrender to a master | - |
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| (noun) an abnormally strong craving | - |
| (noun) being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs) | Synonyms: dependance, dependence, dependency, habituation |
| addictive | (adjective) causing or characterized by addiction | Synonyms: habit-forming |
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| adduce | (verb) advance evidence for | Synonyms: abduce, cite |
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| adducent | (adjective) especially of muscles; bringing together or drawing toward the midline of the body or toward an adjacent part | Synonyms: adducting, adductive |
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| adducer | (noun) a discussant who offers an example or a reason or a proof | - |
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| adducing | (noun) citing as evidence or proof | - |
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| adduct | (noun) a compound formed by an addition reaction | - |
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| (verb) draw a limb towards the body | - |
| adducting | (adjective) especially of muscles; bringing together or drawing toward the midline of the body or toward an adjacent part | Synonyms: adducent, adductive |
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| adduction | (noun) (physiology) moving of a body part toward the central axis of the body | - |
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| adductive | (adjective) especially of muscles; bringing together or drawing toward the midline of the body or toward an adjacent part | Synonyms: adducent, adducting |
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| adductor | (noun) a muscle that draws a body part toward the median line | Synonyms: adductor muscle |
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| adenocarcinoma | (noun) malignant tumor originating in glandular epithelium | Synonyms: glandular cancer, glandular carcinoma |
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| adenocarcinomatous | (adjective) of or pertaining to adenocarcinoma | - |
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| adenoidectomy | (noun) surgical removal of the adenoids; commonly performed along with tonsillectomy | - |
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| adenomyosarcoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: embryoma of the kidney, nephroblastoma, Wilms' tumor, Wilms tumour |
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| adequacy | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequateness |
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| (noun) the quality of being sufficient for the end in view | Synonyms: sufficiency |
| adherence | (noun) faithful support for a cause or political party or religion | Synonyms: adhesion, attachment |
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| (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adhesion, adhesiveness, bond |
| adhocracy | (noun) an organization with little or no structure | - |
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| adiabatic | (adjective) occurring without loss or gain of heat | - |
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| adiabaticity | (noun) The condition of occurring without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation). | - |
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| adience | (noun) (psychology) an urge to accept or approach a situation or an object | - |
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| adjacency | (noun) the attribute of being so near as to be touching | Synonyms: contiguity, contiguousness |
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| adjacent | (adjective) nearest in space or position; immediately adjoining without intervening space | Synonyms: next, side by side |
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| (adjective) having a common boundary or edge; abutting; touching | Synonyms: conterminous, contiguous, neighboring, neighbouring |
| (adjective) near or close to but not necessarily touching | - |
| adjectival | (adjective) of or relating to or functioning as an adjective | Synonyms: adjective |
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| adjectivally | (adverb) as an adjective; in an adjectival manner | - |
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| adjective | (adjective) relating to court practice and procedure as opposed to the principles of law | Synonyms: procedural |
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| (adjective) of or relating to or functioning as an adjective | Synonyms: adjectival |
| (noun) a word that expresses an attribute of something | - |
| (noun) the word class that qualifies nouns | - |
| adjectively | (adverb) as an adjective | - |
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| adjudicate | (verb) bring to an end; settle conclusively | Synonyms: decide, resolve, settle |
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| (verb) put on trial or hear a case and sit as the judge at the trial of | Synonyms: judge, try |
| adjudication | (noun) the final judgment in a legal proceeding; the act of pronouncing judgment based on the evidence presented | - |
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| adjudicative | (adjective) concerned with adjudicating | Synonyms: adjudicatory |
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| adjudicator | (noun) a person who studies and settles conflicts and disputes | - |
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| adjudicatory | (adjective) concerned with adjudicating | Synonyms: adjudicative |
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| adjunct | (adjective) of or relating to a person who is subordinate to another | Synonyms: assistant |
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| (adjective) furnishing added support | Synonyms: accessory, adjuvant, ancillary, appurtenant, auxiliary |
| (noun) a construction that can be used to extend the meaning of a word or phrase but is not one of the main constituents of a sentence | - |
| (noun) something added to another thing but not an essential part of it | - |
| (noun) a person who is an assistant or subordinate to another | - |
| adjunction | (noun) an act of joining or adjoining things | Synonyms: junction |
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| adjunctive | (adjective) joining; forming an adjunct | - |
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| admittance | (noun) the act of admitting someone to enter | Synonyms: admission |
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| (noun) the right to enter | Synonyms: access, accession, admission, entree |
| adolesce | (verb) become adolescent; pass through adolescence | - |
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| adolescence | (noun) in the state that someone is in between puberty and adulthood | - |
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| (noun) the time period between the beginning of puberty and adulthood | - |
| adolescent | (adjective) relating to or peculiar to or suggestive of an adolescent | - |
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| (adjective) in the state of development between puberty and maturity | - |
| (adjective) displaying or suggesting a lack of maturity | Synonyms: jejune, juvenile, puerile |
| (adjective) being of the age 13 through 19 | Synonyms: teen, teenage, teenaged |
| (noun) a juvenile between the onset of puberty and maturity | Synonyms: stripling, teen, teenager |
| adrenalectomy | (noun) surgical removal of one or both adrenal glands | Synonyms: suprarenalectomy |
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| adrenarche | (noun) the increase in activity of the adrenal glands just before puberty | - |
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| adrenergic | (adjective) relating to epinephrine (its release or action) | Synonyms: sympathomimetic |
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| (noun) drug that has the effects of epinephrine | Synonyms: adrenergic drug |
| adrenocortical | (adjective) of or derived from the cortex of the adrenal glands | - |
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