| adumbration | (noun) a sketchy or imperfect or faint representation | - |
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| (noun) the act of providing vague advance indications; representing beforehand | Synonyms: foreshadowing, prefiguration |
| advection | (noun) (meteorology) the horizontal transfer of heat or other atmospheric properties | - |
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| advowson | (noun) the right in English law of presenting a nominee to a vacant ecclesiastical benefice | - |
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| aeon | (noun) (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe | Synonyms: eon |
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| (noun) an immeasurably long period of time | Synonyms: eon |
| (noun) the longest division of geological time | Synonyms: eon |
| aeration | (noun) the act of charging a liquid with a gas making it effervescent | - |
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| (noun) the process of exposing to air (so as to purify) | - |
| aesthetician | (noun) a philosopher who specializes in the nature of beauty | Synonyms: esthetician |
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| (noun) a worker skilled in giving beauty treatments (manicures and facials etc.) | Synonyms: esthetician |
| aestivation | (noun) (botany) the arrangement of sepals and petals in a flower bud before it opens | Synonyms: estivation |
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| (noun) (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period | Synonyms: estivation |
| affectation | (noun) a deliberate pretense or exaggerated display | Synonyms: affectedness, mannerism, pose |
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| affection | (noun) a positive feeling of liking | Synonyms: affectionateness, fondness, heart, philia, tenderness, warmheartedness, warmness |
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| affiliation | (noun) the act of becoming formally connected or joined | - |
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| (noun) a social or business relationship | Synonyms: association, tie-up, tie |
| affirmation | (noun) a judgment by a higher court that the judgment of a lower court was correct and should stand | - |
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| (noun) a statement asserting the existence or the truth of something | Synonyms: avouchment, avowal |
| (noun) (religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds) | - |
| (noun) the act of affirming or asserting or stating something | Synonyms: assertion, statement |
| affixation | (noun) formation of a word by means of an affix | - |
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| (noun) the act of attaching or affixing something | Synonyms: attachment |
| (noun) the result of adding an affix to a root word | - |
| affliction | (noun) a cause of great suffering and distress | - |
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| (noun) a condition of suffering or distress due to ill health | - |
| (noun) a state of great suffering and distress due to adversity | - |
| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| affrication | (noun) the conversion of a simple stop consonant into an affricate | - |
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| affusion | (noun) the act of baptizing someone by pouring water on their head | - |
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| afghan | (noun) a blanket knitted or crocheted in strips or squares; sometimes used as a shawl | - |
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| (noun) a coat made of sheepskin | Synonyms: sheepskin coat |
| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| afternoon | (noun) a conventional expression of greeting or farewell, used to wish someone a good afternoon | Synonyms: good afternoon |
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| (noun) the part of the day between noon and evening | - |
| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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| agglomeration | (noun) the act of collecting in a mass; the act of agglomerating | - |
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| (noun) a jumbled collection or mass | - |
| agglutination | (noun) the building of words from component morphemes that retain their form and meaning in the process of combining | - |
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| (noun) a clumping of bacteria or red cells when held together by antibodies (agglutinins) | - |
| (noun) the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated | Synonyms: agglutinating activity |
| agglutinin | (noun) an antibody that causes agglutination of a specific antigen | - |
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| agglutinogen | (noun) any substance that acts as an antigen to cause agglutinin production | - |
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| aggravation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: irritation, provocation |
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| (noun) action that makes a problem or a disease (or its symptoms) worse | Synonyms: exacerbation |
| (noun) an exasperated feeling of annoyance | Synonyms: exasperation |
| aggregation | (noun) the act of gathering something together | Synonyms: assembling, collecting, collection |
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| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, assemblage, collection |
| aggression | (noun) violent action that is hostile and usually unprovoked | Synonyms: hostility |
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| (noun) deliberately unfriendly behavior | - |
| (noun) the act of initiating hostilities | - |
| (noun) a disposition to behave aggressively | - |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggressiveness |
| agitation | (noun) disturbance usually in protest | Synonyms: excitement, hullabaloo, turmoil, upheaval |
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| (noun) the act of agitating something; causing it to move around (usually vigorously) | - |
| (noun) the feeling of being agitated; not calm | - |
| (noun) a state of agitation or turbulent change or development | Synonyms: ferment, fermentation, tempestuousness, unrest |
| (noun) a mental state of extreme emotional disturbance | - |
| agnathan | (noun) eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms | Synonyms: jawless fish, jawless vertebrate |
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| agnation | (noun) line of descent traced through the paternal side of the family | Synonyms: patrilineage |
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| agnomen | (noun) an additional name or an epithet appended to a name (as in `Ferdinand the Great') | - |
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| agon | (noun) a festivity in ancient Greece at which competitors contended for prizes | - |
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| agraphon | (noun) (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings. | - |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| aircraftman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftsman |
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| aircraftsman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftman |
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| aircrewman | (noun) a member of an aircrew | - |
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| airgun | (noun) a gun that propels a projectile by compressed air | Synonyms: air gun, air rifle |
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| airman | (noun) a male who operates an aircraft | - |
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| airwoman | (noun) a woman aviator | Synonyms: aviatress, aviatrix |
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| albumen | (noun) the white part of an egg; the nutritive and protective gelatinous substance surrounding the yolk consisting mainly of albumin dissolved in water | Synonyms: egg white, ovalbumin, white |
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| (noun) a simple water-soluble protein found in many animal tissues and liquids | Synonyms: albumin |
| albumin | (noun) a simple water-soluble protein found in many animal tissues and liquids | Synonyms: albumen |
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| alcapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alkapton, homogentisic acid |
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| alderman | (noun) a member of a municipal legislative body (as a city council) | - |
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| algin | (noun) a gum used especially as a thickener or emulsifier | Synonyms: alginic acid |
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| alien | (noun) a person who comes from a foreign country; someone who does not owe allegiance to your country | Synonyms: foreigner, noncitizen, outlander |
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| (noun) anyone who does not belong in the environment in which they are found | Synonyms: stranger, unknown |
| (noun) a form of life assumed to exist outside the Earth or its atmosphere | Synonyms: extraterrestrial, extraterrestrial being |
| alienation | (noun) the action of alienating; the action of causing to become unfriendly | - |
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| (noun) (law) the voluntary and absolute transfer of title and possession of real property from one person to another | - |
| (noun) the feeling of being alienated from other people | Synonyms: disaffection, estrangement |
| (noun) separation resulting from hostility | Synonyms: estrangement |
| alimentation | (noun) the act of supplying food and nourishment | Synonyms: feeding |
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| (noun) a source of materials to nourish the body | Synonyms: aliment, nourishment, nutriment, nutrition, sustenance, victuals |
| alizarin | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarine |
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| alkapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alcapton, homogentisic acid |
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| allegation | (noun) (law) a formal accusation against somebody (often in a court of law) | - |
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| (noun) statements affirming or denying certain matters of fact that you are prepared to prove | Synonyms: allegement |
| allergen | (noun) any substance that can cause an allergy | - |
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| alleviation | (noun) the act of reducing something unpleasant (as pain or annoyance) | Synonyms: easement, easing, relief |
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| (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: assuagement, relief |
| alliteration | (noun) use of the same consonant at the beginning of each stressed syllable in a line of verse | Synonyms: beginning rhyme, head rhyme, initial rhyme |
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| allocation | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allotment, apportioning, apportionment, assignation, parceling, parcelling |
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| (noun) (computer science) the assignment of particular areas of a magnetic disk to particular data or instructions | Synonyms: storage allocation |
| (noun) a share set aside for a specific purpose | Synonyms: allotment |
| allocution | (noun) (rhetoric) a formal or authoritative address that advises or exhorts | - |
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| allusion | (noun) passing reference or indirect mention | - |
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| alluviation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: deposit, sedimentation |
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| alluvion | (noun) clay or silt or gravel carried by rushing streams and deposited where the stream slows down | Synonyms: alluvial deposit, alluvial sediment, alluvium |
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| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: deluge, flood, inundation |
| (noun) gradual formation of new land, by recession of the sea or deposit of sediment | - |
| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alsatian | (noun) breed of large shepherd dogs used in police work and as a guide for the blind | Synonyms: German police dog, German shepherd, German shepherd dog |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| alteration | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: revision |
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| (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: adjustment, modification |
| (noun) an event that occurs when something passes from one state or phase to another | Synonyms: change, modification |
| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| alternation | (noun) successive change from one thing or state to another and back again | - |
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| amalgamation | (noun) the combination of two or more commercial companies | Synonyms: merger, uniting |
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| amazon | (noun) mainly green tropical American parrots | - |
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| (noun) a large strong and aggressive woman | Synonyms: virago |
| ambition | (noun) a strong drive for success | Synonyms: ambitiousness |
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| (noun) a cherished desire | Synonyms: aspiration, dream |
| ambiversion | (noun) (psychology) a balanced disposition intermediate between extroversion and introversion | - |
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| ambulation | (noun) walking about | - |
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| amelioration | (noun) the act of relieving ills and changing for the better | Synonyms: betterment, melioration |
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| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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| ammonification | (noun) impregnation with ammonia or a compound of ammonia | - |
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| ammunition | (noun) projectiles to be fired from a gun | Synonyms: ammo |
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| (noun) information that can be used to attack or defend a claim or argument or viewpoint | - |
| (noun) any nuclear or chemical or biological material that can be used as a weapon of mass destruction | - |
| amnion | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnios, amniotic sac |
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| amortisation | (noun) payment of an obligation in a series of installments or transfers | Synonyms: amortization |
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| (noun) the reduction of the value of an asset by prorating its cost over a period of years | Synonyms: amortization |
| amortization | (noun) payment of an obligation in a series of installments or transfers | Synonyms: amortisation |
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| (noun) the reduction of the value of an asset by prorating its cost over a period of years | Synonyms: amortisation |
| amoxicillin | (noun) an antibiotic; a semisynthetic oral penicillin (trade names Amoxil and Larotid and Polymox and Trimox and Augmentin) used to treat bacterial infections | Synonyms: Amoxil, Augmentin, Larotid, Polymox, Trimox |
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| amphibian | (noun) cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form | - |
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| (noun) an airplane designed to take off and land on water | Synonyms: amphibious aircraft |
| (noun) a flat-bottomed motor vehicle that can travel on land or water | Synonyms: amphibious vehicle |
| amphotericin | (noun) an antibiotic and antifungal agent | - |
|---|
| ampicillin | (noun) semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin) | Synonyms: Polycillin, Principen, SK-Ampicillin |
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| amplification | (noun) (electronics) the act of increasing voltage or power or current | - |
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| (noun) addition of extra material or illustration or clarifying detail | Synonyms: elaboration |
| (noun) the amount of increase in signal power or voltage or current expressed as the ratio of output to input | Synonyms: gain |
| amputation | (noun) a surgical removal of all or part of a limb | - |
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| (noun) a condition of disability resulting from the loss of one or more limbs | - |
| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
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| anacoluthon | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthia |
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| anathematisation | (noun) the formal act of pronouncing (someone or something) accursed | Synonyms: anathematization |
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| anathematization | (noun) the formal act of pronouncing (someone or something) accursed | Synonyms: anathematisation |
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| anatotitan | (noun) one of the largest and most famous duck-billed dinosaurs | - |
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| anatoxin | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: toxoid |
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| anchorman | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorperson |
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| anchorperson | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorman |
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| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| andiron | (noun) metal supports for logs in a fireplace | Synonyms: dog-iron, dog, firedog |
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| androgen | (noun) male sex hormone that is produced in the testes and responsible for typical male sexual characteristics | Synonyms: androgenic hormone |
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| aneurin | (noun) a B vitamin that prevents beriberi; maintains appetite and growth | Synonyms: antiberiberi factor, thiamin, thiamine, vitamin B1 |
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| angiotensin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotonin, Hypertensin |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| angulation | (noun) the act of making angulate (having corners) | - |
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| (noun) the precise measurement of angles | - |
| animadversion | (noun) harsh criticism or disapproval | Synonyms: censure |
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