| abandon | (noun) the trait of lacking restraint or control; reckless freedom from inhibition or worry | Synonyms: unconstraint, wantonness |
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| (noun) a feeling of extreme emotional intensity | Synonyms: wildness |
| abandonment | (noun) withdrawing support or help despite allegiance or responsibility | Synonyms: defection, desertion |
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| (noun) the voluntary surrender of property (or a right to property) without attempting to reclaim it or give it away | - |
| (noun) the act of giving something up | Synonyms: desertion, forsaking |
| absconder | (noun) a fugitive who runs away and hides to avoid arrest or prosecution | - |
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| abscondment | (noun) the act of running away secretly (as to avoid arrest) | Synonyms: decampment |
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| absentmindedness | (noun) preoccupation so great that the ordinary demands on attention are ignored | - |
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| abundance | (noun) the property of a more than adequate quantity or supply | Synonyms: copiousness, teemingness |
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| (noun) (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million | - |
| (noun) (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present | - |
| accelerando | (noun) a gradually increasing tempo of music | - |
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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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| addend | (noun) a number that is added to another number (the augend) | - |
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| addendum | (noun) textual matter that is added onto a publication; usually at the end | Synonyms: postscript, supplement |
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| agenda | (noun) a temporally organized plan for matters to be attended to | Synonyms: docket, schedule |
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| (noun) a list of matters to be taken up (as at a meeting) | Synonyms: agendum, order of business |
| agendum | (noun) a list of matters to be taken up (as at a meeting) | Synonyms: agenda, order of business |
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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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| alendronate | (noun) a tablet (trade name Fosamax) prescribed to prevent or treat osteoporosis in women after menopause | Synonyms: Fosamax |
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| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| allamanda | (noun) a plant of the genus Allamanda having large showy funnel-shaped flowers in terminal cymes | - |
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| allemande | (noun) egg-thickened veloute | Synonyms: allemande sauce |
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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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| almond | (noun) oval-shaped edible seed of the almond tree | - |
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| (noun) small bushy deciduous tree native to Asia and North Africa having pretty pink blossoms and highly prized edible nuts enclosed in a hard green hull; cultivated in southern Australia and California | Synonyms: Amygdalus communis, Prunus amygdalus, Prunus dulcis, sweet almond |
| alundum | (noun) a substance made of fused alumina | - |
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| amendment | (noun) the act of amending or correcting | - |
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| (noun) a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.) | - |
| amends | (noun) something done or paid in expiation of a wrong | Synonyms: reparation |
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| (noun) a sum of money paid in compensation for loss or injury | Synonyms: damages, indemnification, indemnity, redress, restitution |
| ampersand | (noun) a punctuation mark (&) used to represent conjunction (and) | - |
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| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
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| analysand | (noun) a person undergoing psychoanalysis | - |
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| andante | (noun) a musical composition or musical passage to be performed moderately slow | - |
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| (noun) a moderately slow tempo (a walking pace) | - |
| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| andesite | (noun) a dark grey volcanic rock | - |
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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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| andrena | (noun) a bee that is a member of the genus Andrena | Synonyms: andrenid, mining bee |
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| andrenid | (noun) a bee that is a member of the genus Andrena | Synonyms: andrena, mining bee |
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| androecium | (noun) a male gametoecium | - |
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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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| androgenesis | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgeny |
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| androgeny | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgenesis |
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| androglossia | (noun) a woman's voice with male qualities | - |
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| androgyne | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: epicene, epicene person, gynandromorph, hermaphrodite, intersex |
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| androgyny | (noun) showing characteristics of both sexes | Synonyms: bisexuality, hermaphroditism |
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| android | (noun) an automaton that resembles a human being | Synonyms: humanoid, mechanical man |
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| (noun) An operating system from Google for mobile devices | - |
| andromeda | (noun) any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers | - |
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| (noun) broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers | Synonyms: Japanese andromeda, lily-of-the-valley tree, Pieris japonica |
| androphobia | (noun) a morbid fear of men | - |
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| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| andryala | (noun) any plant of the genus Andryala having milky sap and heads of bright yellow flowers | - |
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| appendage | (noun) a part that is joined to something larger | - |
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| (noun) an external body part that projects from the body | Synonyms: extremity, member |
| (noun) a natural prolongation or projection from a part of an organism either animal or plant | Synonyms: outgrowth, process |
| appendectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendicectomy |
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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 | - |
| apprehender | (noun) a person who seizes or arrests (especially a person who seizes or arrests in the name of justice) | - |
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| (noun) a person who knows or apprehends | Synonyms: knower |
| archimandrite | (noun) the superior of an abbey of monks | Synonyms: abbot |
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| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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| armband | (noun) a band worn around the upper arm | - |
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| (noun) worn around arm as identification or to indicate mourning | - |
| ascendance | (noun) the state that exists when one person or group has power over another | Synonyms: ascendancy, ascendence, ascendency, control, dominance |
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| ascendancy | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendence, ascendency, control, dominance |
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| ascendant | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendent, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendent |
| ascendence | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendency, control, dominance |
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| ascendency | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendence, control, dominance |
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| ascendent | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendant |
| ascender | (noun) (printing) the part of tall lowercase letters that extends above the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending above other lowercase letters | - |
| (noun) someone who ascends | - |
| ascending | (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
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| asyndeton | (noun) the omission of conjunctions where they would normally be used | - |
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| attainder | (noun) cancellation of civil rights | Synonyms: civil death |
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| attendance | (noun) the act of being present (at a meeting or event etc.) | Synonyms: attending |
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| (noun) the number of people that are present | - |
| (noun) the frequency with which a person is present | - |
| attendant | (noun) an event or situation that happens at the same time as or in connection with another | Synonyms: accompaniment, co-occurrence, concomitant |
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| (noun) someone who waits on or tends to or attends to the needs of another | Synonyms: attender, tender |
| (noun) a person who is present and participates in a meeting | Synonyms: attendee, attender, meeter |
| attendee | (noun) a person who is present and participates in a meeting | Synonyms: attendant, attender, meeter |
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| attender | (noun) someone who waits on or tends to or attends to the needs of another | Synonyms: attendant, tender |
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| (noun) a person who is present and participates in a meeting | Synonyms: attendant, attendee, meeter |
| (noun) someone who listens attentively | Synonyms: auditor, hearer, listener |
| 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 |
| attosecond | (noun) one quintillionth (10^-18) of a second; one thousandth of a femtosecond | - |
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| augend | (noun) a number to which another number (the addend) is added | - |
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| babyminder | (noun) a person who looks after babies (usually in the person's own home) while the babys' parents are working | Synonyms: baby minder, minder |
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| backband | (noun) a broad band that passes over the back of a horse and supports the shafts of a vehicle | - |
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| backbend | (noun) an acrobatic feat in which the trunk is bent backward from a standing position until the hands touch the floor | - |
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| background | (noun) scenery hung at back of stage | Synonyms: backcloth, backdrop |
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| (noun) (computer science) the area of the screen in graphical user interfaces against which icons and windows appear | Synonyms: desktop, screen background |
| (noun) a person's social heritage: previous experience or training | - |
| (noun) the part of a scene (or picture) that lies behind objects in the foreground | Synonyms: ground |
| (noun) information that is essential to understanding a situation or problem | Synonyms: background knowledge |
| (noun) extraneous signals that can be confused with the phenomenon to be observed or measured | Synonyms: background signal |
| (noun) relatively unimportant or inconspicuous accompanying situation | - |
| (noun) the state of the environment in which a situation exists | Synonyms: scope, setting |
| backgrounder | (noun) a press conference or interview in which a government official explains to reporters the background of an action or policy | - |
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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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| backhand | (noun) a return made with the back of the hand facing the direction of the stroke | Synonyms: backhand shot, backhand stroke |
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| backhander | (noun) a backhanded blow | - |
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| badlands | (noun) deeply eroded barren land | - |
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| band | (noun) a thin flat strip of flexible material that is worn around the body or one of the limbs (especially to decorate the body) | - |
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| (noun) an adornment consisting of a strip of a contrasting color or material | Synonyms: banding, stripe |
| (noun) a restraint put around something to hold it together | - |
| (noun) jewelry consisting of a circlet of precious metal (often set with jewels) worn on the finger | Synonyms: ring |
| (noun) a strip of material attached to the leg of a bird to identify it (as in studies of bird migration) | Synonyms: ring |
| (noun) a thin flat strip or loop of flexible material that goes around or over something else, typically to hold it together or as a decoration | - |
| (noun) a driving belt in machinery | - |
| (noun) a stripe or stripes of contrasting color | Synonyms: banding, stria, striation |
| (noun) a cord-like tissue connecting two larger parts of an anatomical structure | Synonyms: isthmus |
| (noun) a range of frequencies between two limits | - |
| (noun) instrumentalists not including string players | - |
| (noun) an unofficial association of people or groups | Synonyms: circle, lot, set |
| (noun) a group of musicians playing popular music for dancing | Synonyms: dance band, dance orchestra |
| bandage | (noun) a piece of soft material that covers and protects an injured part of the body | Synonyms: patch |
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| bandaging | (noun) the act of applying a bandage | Synonyms: binding, dressing |
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| bandana | (noun) large and brightly colored handkerchief; often used as a neckerchief | Synonyms: bandanna |
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| bandanna | (noun) large and brightly colored handkerchief; often used as a neckerchief | Synonyms: bandana |
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| bandbox | (noun) a light cylindrical box for holding light articles of attire (especially hats) | - |
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| bandeau | (noun) an undergarment worn by women to support their breasts | Synonyms: bra, brassiere |
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| bandelet | (noun) molding in the form of a ring; at top of a column | Synonyms: annulet, bandelette, bandlet, square and rabbet |
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| bandelette | (noun) molding in the form of a ring; at top of a column | Synonyms: annulet, bandelet, bandlet, square and rabbet |
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| banderilla | (noun) a decorated dart that is implanted in the neck or shoulders of the bull during a bull fight | - |
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| banderillero | (noun) the bullfighter who implants decorated darts (banderillas) into the neck or shoulders of the bull during a bull fight | - |
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| bandicoot | (noun) any of various agile ratlike terrestrial marsupials of Australia and adjacent islands; insectivorous and herbivorous | - |
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| banding | (noun) an adornment consisting of a strip of a contrasting color or material | Synonyms: band, stripe |
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| (noun) a stripe or stripes of contrasting color | Synonyms: band, stria, striation |
| bandit | (noun) an armed thief who is (usually) a member of a band | Synonyms: brigand |
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| banditry | (noun) the practice of plundering in gangs | - |
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