| abdicable | (adjective) capable of being discarded or renounced or relinquished | - |
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| abdicate | (verb) give up, such as power, as of monarchs and emperors, or duties and obligations | Synonyms: renounce |
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| abdication | (noun) a formal resignation and renunciation of powers | Synonyms: stepping down |
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| (noun) the act of abdicating | Synonyms: stepping down |
| abdicator | (noun) one who formally relinquishes an office or responsibility | - |
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| abiding | (adjective) lasting a long time | Synonyms: enduring, imperishable |
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| abounding | (adjective) existing in abundance | Synonyms: galore |
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| absurdity | (noun) a ludicrous folly | Synonyms: fatuity, fatuousness, silliness |
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| (noun) a message whose content is at variance with reason | Synonyms: absurdness, ridiculousness |
| acardia | (noun) congenital absence of the heart (as in the development of some monsters) | - |
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| acaridiasis | (noun) infestation with itch mites | Synonyms: acariasis, acariosis |
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| according | (adjective) (followed by `to') in agreement with or accordant with | - |
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| (adjective) (followed by `to') as reported or stated by | - |
| accordingly | (adverb) (sentence connectors) because of the reason given | Synonyms: consequently |
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| (adverb) in accordance with | - |
| accordion | (noun) a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the player | Synonyms: squeeze box |
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| accordionist | (noun) a musician who plays the accordion | - |
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| accredit | (verb) ascribe an achievement to | Synonyms: credit |
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| (verb) grant credentials to | Synonyms: recognise, recognize |
| (verb) provide or send (envoys or ambassadors) with official credentials | - |
| accreditation | (noun) the act of granting credit or recognition (especially with respect to an educational institution that maintains suitable standards) | - |
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| accredited | (adjective) given official approval to act | Synonyms: commissioned, licenced, licensed |
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| acedia | (noun) apathy and inactivity in the practice of virtue (personified as one of the deadly sins) | Synonyms: laziness, sloth |
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| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| acetphenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, phenacetin |
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| acidic | (adjective) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) | - |
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| (adjective) being sour to the taste | Synonyms: acid, acidulent, acidulous |
| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| acidify | (verb) turn acidic | Synonyms: acetify |
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| (verb) make sour or more sour | Synonyms: acetify, acidulate, sour |
| acidimetric | (adjective) involving or related to acidimetry | - |
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| acidimetry | (noun) volumetric analysis using standard solutions of acids to measure the amount of a base present | - |
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| acidity | (noun) pH values below 7 | - |
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| (noun) the property of being acidic | Synonyms: sour, sourness |
| (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidulousness |
| acridid | (noun) grasshopper with short antennae | Synonyms: short-horned grasshopper |
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| acridity | (noun) extreme bitterness | Synonyms: acridness |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridness |
| (noun) having an acrid smell | - |
| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| addible | (adjective) capable of being added or added to | Synonyms: addable |
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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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| 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 | - |
| 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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| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| adience | (noun) (psychology) an urge to accept or approach a situation or an object | - |
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| adient | (adjective) characterized by acceptance or approach | - |
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| adieu | (noun) a farewell remark | Synonyms: adios, arrivederci, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| adios | (noun) a farewell remark | Synonyms: adieu, arrivederci, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| adipose | (adjective) composed of animal fat | - |
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| adiposeness | (noun) having the property of containing fat | Synonyms: adiposity, fattiness |
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| adiposis | (noun) the property of excessive fatness | Synonyms: corpulence, overweight, stoutness |
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| adiposity | (noun) having the property of containing fat | Synonyms: adiposeness, fattiness |
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| adit | (noun) a nearly horizontal passage from the surface into a mine | - |
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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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| aeromedical | (adjective) of or relating to aviation medicine | - |
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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| aggrandise | (verb) add details to | Synonyms: aggrandize, blow up, dramatise, dramatize, embellish, embroider, lard, pad |
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| aggrandisement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandizement, elevation |
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| aggrandize | (verb) add details to | Synonyms: aggrandise, blow up, dramatise, dramatize, embellish, embroider, lard, pad |
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| aggrandizement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandisement, elevation |
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| aldehydic | (adjective) of or related to or containing aldehydes | - |
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| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
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| almandine | (noun) a purple variety of the ruby spinel | - |
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| (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandite |
| almandite | (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandine |
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| altitudinal | (adjective) pertaining to altitude | - |
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| altitudinous | (adjective) indefinitely high; lofty | - |
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| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
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| amphidiploidy | (noun) the condition of being amphidiploid | - |
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| anadiplosis | (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: reduplication |
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| anaphrodisia | (noun) decline or absence of sexual desire | - |
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| anaphrodisiac | (adjective) tending to diminish sexual desire | - |
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| andiron | (noun) metal supports for logs in a fireplace | Synonyms: dog-iron, dog, firedog |
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| andradite | (noun) a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone | - |
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| angiocardiogram | (noun) a series of X rays representing the action of the heart and its blood vessels after the injection of a radiopaque substance | - |
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| anodic | (adjective) of or at or relating to an anode | Synonyms: anodal |
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| anodise | (verb) coat a metal with an oxide coat | Synonyms: anodize |
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| anodize | (verb) coat a metal with an oxide coat | Synonyms: anodise |
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| anorchidism | (noun) absence of one of both testes | Synonyms: anorchia, anorchism |
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| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| (noun) a very old person | Synonyms: ancient |
| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| antemeridian | (adjective) before noon | - |
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| antheridial | (adjective) relating to or characterized by an antheridium | - |
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| antheridiophore | (noun) gametophore bearing antheridia as in certain mosses and liverworts | - |
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| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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| antidiabetic | (noun) a drug used to treat diabetes mellitus | Synonyms: antidiabetic drug |
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| antidiarrheal | (noun) a drug used to control or stop diarrhea | Synonyms: antidiarrheal drug |
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| antidiuretic | (noun) a drug that limits the formation of urine | Synonyms: antidiuretic drug |
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| antispasmodic | (noun) a drug used to relieve or prevent spasms (especially of the smooth muscles) | Synonyms: antispasmodic agent, spasmolytic |
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| aperiodic | (adjective) not recurring at regular intervals | Synonyms: nonperiodic |
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| aphrodisia | (noun) a desire for heterosexual intimacy | - |
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| aphrodisiac | (adjective) stimulating sexual desire | Synonyms: aphrodisiacal, sexy |
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| (noun) a drug or other agent that stimulates sexual desire | - |
| aphrodisiacal | (adjective) stimulating sexual desire | Synonyms: aphrodisiac, sexy |
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| apodictic | (adjective) of a proposition; necessarily true or logically certain | Synonyms: apodeictic |
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| appendicectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendectomy |
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| appendicitis | (noun) inflammation of the vermiform appendix | - |
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| appendicle | (noun) a small appendage | - |
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| appendicular | (adjective) relating to or consisting of an appendage or appendages; especially the limbs | - |
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| appendicularia | (noun) free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates | - |
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| appendix | (noun) a vestigial process that extends from the lower end of the cecum and that resembles a small pouch | Synonyms: cecal appendage, vermiform appendix, vermiform process |
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| (noun) supplementary material that is collected and appended at the back of a book | - |
| aptitudinal | (adjective) of or relating to aptitudes | - |
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