| acidotic | (adjective) having or being characterized by acidosis | - |
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| acoustic | (adjective) of or relating to the science of acoustics | Synonyms: acoustical |
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| (noun) a remedy for hearing loss or deafness | - |
| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acoustically | (adverb) with respect to acoustics | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acoustics | (noun) the study of the physical properties of sound | - |
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| acquisition | (noun) the act of contracting or assuming or acquiring possession of something | - |
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| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, attainment, skill |
| (noun) the cognitive process of acquiring skill or knowledge | Synonyms: learning |
| (noun) something acquired | - |
| acquisitive | (adjective) eager to acquire and possess things especially material possessions or ideas | - |
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| acquisitiveness | (noun) strong desire to acquire and possess | - |
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| acritical | (adjective) without a crisis (as of some diseases) | - |
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| acrobatic | (adjective) vigorously active | Synonyms: athletic, gymnastic |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| 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 | - |
| actualisation | (noun) making real or giving the appearance of reality | Synonyms: actualization, realisation, realization |
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| actualization | (noun) making real or giving the appearance of reality | Synonyms: actualisation, realisation, realization |
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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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| acylation | (noun) the process of introducing an acyl group into a compound | - |
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| adamantine | (adjective) consisting of or having the hardness of adamant | - |
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| (adjective) having the hardness of a diamond | - |
| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, inexorable, intransigent |
| adaptation | (noun) (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) | - |
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| (noun) a written work (as a novel) that has been recast in a new form | Synonyms: version |
| (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaption, adjustment |
| adaptational | (adjective) of or relating to adaptation | - |
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| adaptative | (adjective) having a capacity for adaptation | Synonyms: adaptive |
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| adaption | (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaptation, adjustment |
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| adaptive | (adjective) having a capacity for adaptation | Synonyms: adaptative |
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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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| addition | (noun) the arithmetic operation of summing; calculating the sum of two or more numbers | Synonyms: plus, summation |
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| (noun) the act of adding one thing to another | - |
| (noun) a component that is added to something to improve it | Synonyms: add-on, improver |
| (noun) a suburban area laid out in streets and lots for a future residential area | - |
| (noun) something added to what you already have | Synonyms: accession |
| (noun) a quantity that is added | Synonyms: gain, increase |
| additional | (adjective) further or added | Synonyms: extra |
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| additionally | (adverb) in addition, by way of addition; furthermore | Synonyms: to boot |
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| additive | (adjective) characterized or produced by addition | - |
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| (adjective) designating or involving an equation whose terms are of the first degree | Synonyms: linear |
| (noun) something added to enhance food or gasoline or paint or medicine | - |
| 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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| adenitis | (noun) inflammation of a gland or lymph node | - |
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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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| 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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| 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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| 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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| adjuration | (noun) a solemn and earnest appeal to someone to do something | - |
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| adjustive | (adjective) conducive to adjustment | - |
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| administration | (noun) a method of tending to or managing the affairs of some group of people (especially the group's business affairs) | Synonyms: disposal |
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| (noun) the act of administering medication | Synonyms: giving medication |
| (noun) the act of meting out justice according to the law | Synonyms: judicature |
| (noun) the act of governing; exercising authority | Synonyms: governance, governing, government, government activity |
| (noun) the persons (or committees or departments etc.) who make up a body for the purpose of administering something | Synonyms: brass, establishment, governance, governing body, organisation, organization |
| (noun) the tenure of a president | Synonyms: presidency, presidential term |
| administrative | (adjective) of or relating to or responsible for administration | - |
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| administratively | (adverb) by or for an administrator | - |
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| admiration | (noun) a favorable judgment | Synonyms: appreciation |
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| (noun) a feeling of delighted approval and liking | Synonyms: esteem |
| (noun) the feeling aroused by something strange and surprising | Synonyms: wonder, wonderment |
| admittible | (adjective) deserving to be allowed to enter | Synonyms: admittable |
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| admonition | (noun) a firm rebuke | Synonyms: admonishment, monition |
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| (noun) cautionary advice about something imminent (especially imminent danger or other unpleasantness) | Synonyms: monition, warning, word of advice |
| adoption | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptance, acceptation, espousal |
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| (noun) the appropriation (of ideas or words etc) from another source | Synonyms: borrowing |
| (noun) a legal proceeding that creates a parent-child relation between persons not related by blood; the adopted child is entitled to all privileges belonging to a natural child of the adoptive parents (including the right to inherit) | - |
| adoptive | (adjective) of parents and children; related by adoption | - |
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| (adjective) acquired as your own by free choice | Synonyms: adopted |