| acantholysis | (noun) a breakdown of a cell layer in the epidermis (as in pemphigus) | - |
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| acanthoma | (noun) a neoplasm originating in the epidermis | Synonyms: skin tumor |
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| acanthopterygian | (noun) a teleost fish with fins that are supported by sharp inflexible rays | Synonyms: spiny-finned fish |
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| acanthosis | (noun) an abnormal but benign thickening of the prickle-cell layer of the skin (as in psoriasis) | - |
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| acanthus | (noun) any plant of the genus Acanthus having large spiny leaves and spikes or white or purplish flowers; native to Mediterranean region but widely cultivated | - |
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| acapnia | (noun) a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing | Synonyms: hypocapnia |
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| acarine | (noun) mite or tick | - |
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| accelerando | (noun) a gradually increasing tempo of music | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accent | (noun) the relative prominence of a syllable or musical note (especially with regard to stress or pitch) | Synonyms: emphasis, stress |
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| (noun) distinctive manner of oral expression | Synonyms: speech pattern |
| (noun) a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation | Synonyms: accent mark |
| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: dialect, idiom |
| (noun) special importance or significance | Synonyms: emphasis |
| accenting | (noun) the act of giving special importance or significance to something | Synonyms: accentuation, emphasizing |
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| accentor | (noun) small sparrow-like songbird of mountainous regions of Eurasia | - |
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| accentuation | (noun) the act of giving special importance or significance to something | Synonyms: accenting, emphasizing |
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| (noun) the use or application of an accent; the relative prominence of syllables in a phrase or utterance | - |
| acceptableness | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptability |
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| acceptance | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptation, adoption, espousal |
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| (noun) the act of taking something that is offered | - |
| (noun) a disposition to tolerate or accept people or situations | Synonyms: sufferance, toleration |
| (noun) the mental attitude that something is believable and should be accepted as true | Synonyms: credence |
| (noun) (contract law) words signifying consent to the terms of an offer (thereby creating a contract) | - |
| (noun) a time draft drawn on and accepted by a bank | Synonyms: banker's acceptance |
| (noun) the state of being acceptable and accepted | - |
| acceptation | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptance, adoption, espousal |
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| (noun) the accepted meaning of a word | Synonyms: word meaning, word sense |
| (noun) acceptance as true or valid | - |
| accession | (noun) the act of attaining or gaining access to a new office or right or position (especially the throne) | Synonyms: rise to power |
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| (noun) the right to enter | Synonyms: access, admission, admittance, entree |
| (noun) agreeing with or consenting to (often unwillingly) | Synonyms: assenting |
| (noun) something added to what you already have | Synonyms: addition |
| (noun) (civil law) the right to all of that which your property produces whether by growth or improvement | - |
| (noun) a process of increasing by addition (as to a collection or group) | - |
| accidence | (noun) the part of grammar that deals with the inflections of words | Synonyms: inflectional morphology |
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| accident | (noun) anything that happens suddenly or by chance without an apparent cause | Synonyms: chance event, fortuity, stroke |
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| (noun) an unfortunate mishap; especially one causing damage or injury | - |
| accidental | (noun) a musical notation that makes a note sharp or flat or natural although that is not part of the key signature | - |
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| acclamation | (noun) enthusiastic approval | Synonyms: acclaim, eclat, plaudit, plaudits |
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| acclimation | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimatisation, acclimatization |
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| acclimatisation | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimation, acclimatization |
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| acclimatization | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimation, acclimatisation |
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| accommodation | (noun) the act of providing something (lodging or seat or food) to meet a need | - |
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| (noun) (physiology) the automatic adjustment in focal length of the natural lens of the eye | - |
| (noun) living quarters provided for public convenience | - |
| (noun) in the theories of Jean Piaget: the modification of internal representations in order to accommodate a changing knowledge of reality | - |
| (noun) a settlement of differences | - |
| (noun) making or becoming suitable; adjusting to circumstances | Synonyms: adjustment, fitting |
| accompaniment | (noun) the act of accompanying someone or something in order to protect them | Synonyms: escort |
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| (noun) something added to complete or embellish or make perfect | Synonyms: complement |
| (noun) a musical part (vocal or instrumental) that supports or provides background for other musical parts | Synonyms: backup, musical accompaniment, support |
| (noun) an event or situation that happens at the same time as or in connection with another | Synonyms: attendant, co-occurrence, concomitant |
| accompanist | (noun) a person who provides musical accompaniment (usually on a piano) | Synonyms: accompanyist |
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| accompanyist | (noun) a person who provides musical accompaniment (usually on a piano) | Synonyms: accompanist |
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| accomplishment | (noun) the action of accomplishing something | Synonyms: achievement |
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| (noun) an ability that has been acquired by training | Synonyms: acquirement, acquisition, attainment, skill |
| accordance | (noun) the act of granting rights | Synonyms: accordance of rights |
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| (noun) concurrence of opinion | Synonyms: accord, conformity |
| 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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| accouchement | (noun) the parturition process in human beings; having a baby; the process of giving birth to a child | Synonyms: childbearing, childbirth, vaginal birth |
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| account | (noun) the quality of taking advantage | - |
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| (noun) importance or value | - |
| (noun) a record or narrative description of past events | Synonyms: chronicle, history, story |
| (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: bill, invoice |
| (noun) a short account of the news | Synonyms: news report, report, story, write up |
| (noun) a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc. | Synonyms: explanation |
| (noun) the act of informing by verbal report | Synonyms: report |
| (noun) grounds | Synonyms: score |
| (noun) a statement of recent transactions and the resulting balance | Synonyms: account statement, accounting |
| (noun) a formal contractual relationship established to provide for regular banking or brokerage or business services | Synonyms: business relationship |
| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| accountancy | (noun) the occupation of maintaining and auditing records and preparing financial reports for a business | Synonyms: accounting |
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| accountant | (noun) someone who maintains and audits business accounts | Synonyms: comptroller, controller |
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| accountantship | (noun) the position of accountant | - |
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| accounting | (noun) the occupation of maintaining and auditing records and preparing financial reports for a business | Synonyms: accountancy |
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| (noun) a system that provides quantitative information about finances | - |
| (noun) a convincing explanation that reveals basic causes | - |
| (noun) a statement of recent transactions and the resulting balance | Synonyms: account, account statement |
| (noun) a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts | Synonyms: accounting system, method of accounting |
| accouterment | (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accessory, accoutrement |
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| accoutrement | (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accessory, accouterment |
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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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| accretion | (noun) (law) an increase in a beneficiary's share in an estate (as when a co-beneficiary dies or fails to meet some condition or rejects the inheritance) | - |
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| (noun) an increase by natural growth or addition | Synonyms: accumulation |
| (noun) (geology) an increase in land resulting from alluvial deposits or waterborne sediment | - |
| (noun) (biology) growth by addition as by the adhesion of parts or particles | - |
| (noun) (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases | - |
| (noun) something contributing to growth or increase | - |
| accruement | (noun) the act of accumulating | Synonyms: accrual, accumulation |
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| acculturation | (noun) the adoption of the behavior patterns of the surrounding culture | Synonyms: enculturation, socialisation, socialization |
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| (noun) all the knowledge and values shared by a society | Synonyms: culture |
| (noun) the process of assimilating new ideas into an existing cognitive structure | Synonyms: assimilation |
| accumulation | (noun) the act of accumulating | Synonyms: accrual, accruement |
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| (noun) several things grouped together or considered as a whole | Synonyms: aggregation, assemblage, collection |
| (noun) (finance) profits that are not paid out as dividends but are added to the capital base of the corporation | - |
| (noun) an increase by natural growth or addition | Synonyms: accretion |
| accusation | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusal |
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| (noun) an assertion that someone is guilty of a fault or offence | Synonyms: charge |
| acetaminophen | (noun) an analgesic for mild pain but not for inflammation; also used as an antipyretic; (Datril, Tylenol, Panadol, Phenaphen, Tempra, and Anacin III are trademarks of brands of acetaminophen tablets) | Synonyms: Anacin III, Datril, Panadol, Phenaphen, Tempra, Tylenol |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| acetin | (noun) any of three liquid acetates that are formed when acetic acid and glycerin are heated together | - |
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| acetone | (noun) the simplest ketone; a highly flammable liquid widely used as an organic solvent and as material for making plastics | Synonyms: dimethyl ketone, propanone |
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| acetonemia | (noun) an abnormal increase of ketone bodies in the blood as in diabetes mellitus | Synonyms: ketonemia, ketosis |
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| acetonuria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: ketoaciduria, ketonuria |
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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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| acetylation | (noun) the process of introducing an acetyl group into a compound | - |
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| acetylcholine | (noun) a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems | - |
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| acetylene | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: alkyne, ethyne |
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| achene | (noun) small dry indehiscent fruit with the seed distinct from the fruit wall | - |
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| achievement | (noun) the action of accomplishing something | Synonyms: accomplishment |
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| achimenes | (noun) any plant of the genus Achimenes having showy bell-shaped flowers that resemble gloxinias | Synonyms: hot water plant |
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| aching | (noun) a dull persistent (usually moderately intense) pain | Synonyms: ache |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| acidulousness | (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidity |
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| acinus | (noun) one of the small sacs or saclike dilations in a compound gland | - |
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| (noun) one of the small drupes making up an aggregate or multiple fruit like a blackberry | - |
| acknowledgement | (noun) a statement acknowledging something or someone | Synonyms: acknowledgment |
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| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgment, recognition |
| acknowledgment | (noun) a statement acknowledging something or someone | Synonyms: acknowledgement |
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| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: citation, cite, credit, mention, quotation, reference |
| (noun) the state or quality of being recognized or acknowledged | Synonyms: acknowledgement, recognition |
| acne | (noun) an inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones | - |
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| aconite | (noun) any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers | - |
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| acorn | (noun) fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acquaintance | (noun) personal knowledge or information about someone or something | Synonyms: conversance, conversancy, familiarity |
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| (noun) a person with whom you are acquainted | Synonyms: friend |
| (noun) a relationship less intimate than friendship | Synonyms: acquaintanceship |
| acquaintanceship | (noun) a relationship less intimate than friendship | Synonyms: acquaintance |
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| acquiescence | (noun) agreement with a statement or proposal to do something | Synonyms: assent |
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| (noun) acceptance without protest | - |
| acquirement | (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquisition, attainment, skill |
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| acquiring | (noun) the act of acquiring something | Synonyms: getting |
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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 | - |
| acquisitiveness | (noun) strong desire to acquire and possess | - |
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| acquittance | (noun) a legal document evidencing the discharge of a debt or obligation | Synonyms: release |
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| acridness | (noun) extreme bitterness | Synonyms: acridity |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridity |
| acrimony | (noun) a rough and bitter manner | Synonyms: acerbity, bitterness, jaundice, tartness, thorniness |
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| acroanaesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanesthesia |
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| acroanesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanaesthesia |
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| acrocyanosis | (noun) cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion | Synonyms: Raynaud's sign |
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| acrodont | (noun) an animal having teeth consolidated with the summit of the alveolar ridge without sockets | - |
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| acrogen | (noun) any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem | - |
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| acrolein | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: propenal |
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| acromion | (noun) the outermost point of the spine of the shoulder blade | Synonyms: acromial process |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| acronym | (noun) a word formed from the initial letters of the several words in the name and pronounced as one word | Synonyms: initialism |
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| acrophony | (noun) naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter | - |
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| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| 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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| acting | (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
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| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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