| 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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| 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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| 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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| accreditation | (noun) the act of granting credit or recognition (especially with respect to an educational institution that maintains suitable standards) | - |
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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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| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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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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| 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 |
| 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 |
| 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 |
| additive | (noun) something added to enhance food or gasoline or paint or medicine | - |
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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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| 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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| 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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| adjudication | (noun) the final judgment in a legal proceeding; the act of pronouncing judgment based on the evidence presented | - |
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| adjudicator | (noun) a person who studies and settles conflicts and disputes | - |
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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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| aggrandisement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandizement, elevation |
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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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| 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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| 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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| 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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| anorchidism | (noun) absence of one of both testes | Synonyms: anorchia, anorchism |
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| antediluvian | (noun) a very old person | Synonyms: ancient |
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| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| 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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| aphrodisia | (noun) a desire for heterosexual intimacy | - |
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| aphrodisiac | (noun) a drug or other agent that stimulates sexual desire | - |
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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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| 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 | - |
| archdiocese | (noun) the diocese of an archbishop | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| argyrodite | (noun) a rare steel-grey mineral consisting of silver and germanium and sulfur | - |
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| aridity | (noun) the quality of yielding nothing of value | Synonyms: barrenness, fruitlessness |
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| (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridness, thirstiness |
| armadillo | (noun) burrowing chiefly nocturnal mammal with body covered with strong horny plates | - |
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| ascending | (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
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| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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| asdic | (noun) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return | Synonyms: echo sounder, sonar |
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| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| attending | (noun) the act of being present (at a meeting or event etc.) | Synonyms: attendance |
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| (noun) the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others | Synonyms: attention |
| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| audible | (noun) a football play is changed orally after both teams have assumed their positions at the line of scrimmage | - |
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| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| audience | (noun) a conference (usually with someone important) | Synonyms: consultation, interview |
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| (noun) a gathering of spectators or listeners at a (usually public) performance | - |
| (noun) the part of the general public interested in a source of information, entertainment, or a product/service | - |
| (noun) an opportunity to state your case and be heard | Synonyms: hearing |
| audile | (noun) one whose mental imagery is auditory rather than visual or motor | - |
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| audio | (noun) the sound elements of television | - |
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| (noun) a recording of acoustic signals | Synonyms: audio recording, sound recording |
| (noun) an audible acoustic wave frequency | Synonyms: audio frequency |
| (noun) the audible part of a transmitted signal | Synonyms: sound |
| audiocassette | (noun) a cassette for audiotape | - |
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| audiogram | (noun) a graphical representation of a person's auditory sensitivity to sound | - |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| audiotape | (noun) magnetic tape for use in recording sound | - |
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| (noun) a tape recording of sound | - |
| audiovisual | (noun) materials using sight or sound to present information | Synonyms: audiovisual aid |
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| audit | (noun) a methodical examination or review of a condition or situation | - |
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| (noun) an inspection of the accounting procedures and records by a trained accountant or CPA | Synonyms: audited account |
| audition | (noun) a test of the suitability of a performer | Synonyms: tryout |
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| (noun) the ability to hear; the auditory faculty | Synonyms: auditory modality, auditory sense, hearing, sense of hearing |
| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| autodidact | (noun) a person who has taught himself | - |
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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| awarding | (noun) a grant made by a law court | Synonyms: award |
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| azadirachtin | (noun) insecticide | - |
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| backgrounding | (noun) the execution of low priority programs while higher priority programs are not using the processing system | Synonyms: background processing |
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| backsliding | (noun) a failure to maintain a higher state | Synonyms: lapse, lapsing, relapse, relapsing, reversion, reverting |
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| baddie | (noun) the principal bad character in a film or work of fiction | Synonyms: villain |
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| badinage | (noun) frivolous banter | - |
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| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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