| 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 | - |
| accretionary | (adjective) marked or produced by accretion | - |
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| 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 |
| acculturational | (adjective) of or relating to acculturation | Synonyms: acculturative |
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| accumbent | (adjective) lying down; in a position of comfort or rest | Synonyms: decumbent, recumbent |
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| 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 |
| accusing | (adjective) containing or expressing accusation | Synonyms: accusative, accusatory, accusive |
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| accusingly | (adverb) in an accusing manner | - |
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| acentric | (adjective) lacking a centromere | - |
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| (adjective) not centered or having no center | - |
| 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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| acetonic | (adjective) of or relating to acetone | - |
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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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| acetylenic | (adjective) of or related to acetylene | - |
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| achene | (noun) small dry indehiscent fruit with the seed distinct from the fruit wall | - |
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| achenial | (adjective) pertaining to dry one-seeded indehiscent fruit | - |
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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 | (adjective) causing a dull and steady pain | Synonyms: achy |
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| (noun) a dull persistent (usually moderately intense) pain | Synonyms: ache |
| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achondritic | (adjective) not having a granular structure | - |
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| (adjective) of or related to an achondrite | - |
| 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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| achondroplastic | (adjective) of or relating to achondroplasia | - |
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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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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| acidulent | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulous |
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| acidulousness | (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidity |
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| acinar | (adjective) pertaining to the individual parts making up an aggregate fruit like a blackberry | - |
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| (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinic, acinose, acinous |
| acinic | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinose, acinous |
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| acinose | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinic, acinous |
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| acinous | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinic, acinose |
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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 | - |
| acknowledge | (verb) accept as legally binding and valid | - |
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| (verb) accept (someone) to be what is claimed or accept his power and authority | Synonyms: know, recognise, recognize |
| (verb) declare to be true or admit the existence or reality or truth of | Synonyms: admit |
| (verb) express obligation, thanks, or gratitude for | Synonyms: recognise, recognize |
| (verb) report the receipt of | Synonyms: receipt |
| (verb) express recognition of the presence or existence of, or acquaintance with | Synonyms: notice |
| acknowledgeable | (adjective) capable of being acknowledged | - |
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| acknowledged | (adjective) recognized or made known or admitted | - |
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| (adjective) generally accepted | - |
| 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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| acned | (adjective) (of complexion) blemished by imperfections of the skin | Synonyms: pimpled, pimply, pustulate |
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| acneiform | (adjective) resembling acne | - |
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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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| acquaint | (verb) cause to come to know personally | Synonyms: introduce, present |
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| (verb) make familiar or conversant with | Synonyms: familiarise, familiarize |
| (verb) inform | - |
| 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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| acquainted | (adjective) having fair knowledge of | - |
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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 | - |
| acquiescent | (adjective) willing to carry out the orders or wishes of another without protest | Synonyms: biddable |
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| 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 |
| acrimonious | (adjective) marked by strong resentment or cynicism | Synonyms: bitter |
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| 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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| acrocentric | (adjective) having a subterminal centromere | - |
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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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| acrogenic | (adjective) pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem | Synonyms: acrogenous |
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| acrogenous | (adjective) pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem | Synonyms: acrogenic |
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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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| acronymic | (adjective) characterized by the use of acronyms | Synonyms: acronymous |
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| acronymous | (adjective) characterized by the use of acronyms | Synonyms: acronymic |
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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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| 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 |