| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| accessible | (adjective) capable of being reached | - |
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| (adjective) easy to get along with or talk to; friendly | - |
| (adjective) easily obtained | - |
| (adjective) capable of being read with comprehension | Synonyms: approachable |
| accomplishable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: achievable, doable, manageable, realizable |
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| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| accountable | (adjective) liable to account for one's actions | Synonyms: answerable |
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| accumbent | (adjective) lying down; in a position of comfort or rest | Synonyms: decumbent, recumbent |
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| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| acerb | (adjective) sour or bitter in taste | Synonyms: acerbic, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acerbate | (verb) make sour or bitter | - |
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| (verb) cause to be bitter or resentful | Synonyms: embitter, envenom |
| acerbic | (adjective) sour or bitter in taste | Synonyms: acerb, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acerbity | (noun) a rough and bitter manner | Synonyms: acrimony, bitterness, jaundice, tartness, thorniness |
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| (noun) a sharp sour taste | Synonyms: tartness |
| (noun) a sharp bitterness | - |
| acetabular | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: cotyloid, cotyloidal |
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| acetabulum | (noun) the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint | Synonyms: cotyloid cavity |
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| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| achievable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, doable, manageable, realizable |
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| acknowledgeable | (adjective) capable of being acknowledged | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acquirable | (adjective) capable of being acquired | - |
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| acrobat | (noun) an athlete who performs acts requiring skill and agility and coordination | - |
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| acrobatic | (adjective) vigorously active | Synonyms: athletic, gymnastic |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrophobia | (noun) a morbid fear of great heights | - |
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| acrophobic | (adjective) suffering from acrophobia; abnormally afraid of high places | - |
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| actable | (adjective) capable of being acted; suitable for the stage | - |
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| actionable | (adjective) affording grounds for legal action | - |
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| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| adaptable | (adjective) capable of adapting (of becoming or being made suitable) to a particular situation or use | - |
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| addable | (adjective) capable of being added or added to | Synonyms: addible |
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| addible | (adjective) capable of being added or added to | Synonyms: addable |
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| addlebrained | (adjective) stupid and confused | Synonyms: addlepated, muddleheaded, puddingheaded |
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| addressable | (adjective) capable of being addressed | - |
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| 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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| adjustable | (adjective) capable of being changed so as to match or fit | - |
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| (adjective) capable of being regulated | - |
| administrable | (adjective) capable of being administered or managed | - |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admirable | (adjective) inspiring admiration or approval | - |
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| (adjective) deserving of esteem and respect | Synonyms: estimable, good, honorable, respectable |
| admirableness | (noun) admirable excellence | Synonyms: admirability, wonderfulness |
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| admirably | (adverb) in an admirable manner | Synonyms: commendable, laudably, praiseworthily |
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| admissibility | (noun) acceptability by virtue of being admissible | - |
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| admissible | (adjective) deserving to be admitted | - |
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| admittable | (adjective) deserving to be allowed to enter | Synonyms: admittible |
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| admittible | (adjective) deserving to be allowed to enter | Synonyms: admittable |
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| adobe | (noun) sun-dried brick; used in hot dry climates | Synonyms: adobe brick |
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| (noun) the clay from which adobe bricks are made | - |
| adobo | (noun) a dish of marinated vegetables and meat or fish; served with rice | - |
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| adoptable | (adjective) suitable or eligible for adoption | - |
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| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| adorable | (adjective) lovable especially in a childlike or naive way | Synonyms: endearing, lovely |
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| adorableness | (noun) extreme attractiveness | Synonyms: adorability |
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| adorably | (adverb) in an adorable manner | Synonyms: endearingly |
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| adsorb | (verb) accumulate (liquids or gases) on the surface | - |
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| adsorbable | (adjective) capable of being adsorbed or accumulated on a surface of a solid | Synonyms: adsorbate |
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| adsorbate | (adjective) capable of being adsorbed or accumulated on a surface of a solid | Synonyms: adsorbable |
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| (noun) a material that has been or is capable of being adsorbed | - |
| adsorbent | (adjective) having capacity or tendency to adsorb or cause to accumulate on a surface | Synonyms: adsorptive, surface-assimilative |
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| (noun) a material having capacity or tendency to adsorb another substance | Synonyms: adsorbent material |
| adsorber | (noun) an apparatus used in the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to a surface. | - |
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| adumbrate | (verb) describe roughly or briefly or give the main points or summary of | Synonyms: outline, sketch |
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| (verb) give to understand | Synonyms: insinuate, intimate |
| adumbration | (noun) a sketchy or imperfect or faint representation | - |
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| (noun) the act of providing vague advance indications; representing beforehand | Synonyms: foreshadowing, prefiguration |
| adumbrative | (adjective) indistinctly prophetic | Synonyms: foreshadowing, prefigurative |
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| adverb | (noun) a word that modifies something other than a noun | - |
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| (noun) the word class that qualifies verbs or clauses | - |
| adverbial | (adjective) of or relating to or functioning as an adverb | - |
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| (noun) a word or group of words function as an adverb | - |
| adverbially | (adverb) as an adverb | - |
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| advisability | (noun) the quality of being advisable | - |
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| advisable | (adjective) worthy of being recommended or suggested; prudent or wise | - |
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| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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| aerobic | (adjective) depending on free oxygen or air | Synonyms: aerophilic, aerophilous |
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| (adjective) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency | - |
| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| afebrile | (adjective) having no fever | - |
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| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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| affable | (adjective) diffusing warmth and friendliness | Synonyms: amiable, cordial, genial |
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| affableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, amiability, amiableness, bonhomie, geniality |
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| affably | (adverb) in an affable manner | Synonyms: amiably, genially |
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| affirmable | (adjective) capable of being affirmed or asserted | Synonyms: assertable |
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| affordable | (adjective) that you have the financial means for | Synonyms: low-cost, low-priced |
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| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| afterburner | (noun) a device that injects fuel into a hot exhaust for extra thrust | - |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agoraphobic | (adjective) suffering from agoraphobia; abnormally afraid of open or public places | - |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| agreeable | (adjective) conforming to your own liking or feelings or nature | - |
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| (adjective) prepared to agree or consent | - |
| (adjective) in keeping | Synonyms: accordant, concordant, conformable, consonant |
| agreeableness | (noun) a temperamental disposition to be agreeable | Synonyms: agreeability |
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| (noun) pleasantness resulting from agreeable conditions | Synonyms: amenity |
| agreeably | (adverb) in an enjoyable manner | Synonyms: enjoyably, pleasantly |
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| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| agrobiologic | (adjective) of or pertaining to agrobiology | Synonyms: agrobiological |
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| agrobiological | (adjective) of or pertaining to agrobiology | Synonyms: agrobiologic |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| ahorseback | (adjective) traveling on horseback | Synonyms: ahorse |
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| (adverb) on the back of a horse | Synonyms: ahorse, horseback |
| ailurophobia | (noun) a morbid fear of cats | - |
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| airborne | (adjective) moved or conveyed by or through air | - |
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| airbrake | (noun) a vehicular brake that operates by compressed air; especially for heavy vehicles | - |
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| (noun) a small parachute or articulated flap to reduce the speed of an aircraft | Synonyms: dive brake |
| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| (verb) paint with an airbrush | - |
| airburst | (noun) an explosion in the atmosphere | - |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| akimbo | (adjective) (used of arms and legs) bent outward with the joint away from the body | - |
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| (adverb) with hands on hips and elbows extending outward | - |