| a | (noun) the 1st letter of the Roman alphabet | Synonyms: A |
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| aa | (noun) a dry form of lava resembling clinkers | - |
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| aah | (verb) express admiration and pleasure by uttering `ooh' or `aah' | Synonyms: ooh |
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| aalii | (noun) a small Hawaiian tree with hard dark wood | - |
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| aardvark | (noun) nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata | Synonyms: ant bear, anteater, Orycteropus afer |
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| aardwolf | (noun) striped hyena of southeast Africa that feeds chiefly on insects | Synonyms: Proteles cristata |
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| ab | (noun) the muscles of the abdomen | Synonyms: abdominal, abdominal muscle |
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| aba | (noun) a fabric woven from goat hair and camel hair | - |
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| (noun) a loose sleeveless outer garment made from aba cloth; worn by Arabs | - |
| abaca | (noun) Philippine banana tree having leafstalks that yield Manila hemp used for rope and paper etc | Synonyms: Manila hemp, Musa textilis |
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| (noun) a kind of hemp obtained from the abaca plant in the Philippines | Synonyms: Manila hemp, Manilla hemp |
| abacinate | (verb) blind by holding a red-hot metal plate before someone's eyes | - |
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| aback | (adverb) by surprise | - |
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| (adverb) having the wind against the forward side of the sails | - |
| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| abacus | (noun) a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves | - |
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| (noun) a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave | - |
| abaft | (adverb) at or near or toward the stern of a ship or tail of an airplane | Synonyms: aft, astern |
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| abalone | (noun) any of various large edible marine gastropods of the genus Haliotis having an ear-shaped shell with pearly interior | Synonyms: ear-shell |
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| abamp | (noun) a unit of current equal to 10 amperes | Synonyms: abampere |
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| abampere | (noun) a unit of current equal to 10 amperes | Synonyms: abamp |
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| 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 |
| (verb) leave someone who needs or counts on you; leave in the lurch | Synonyms: desert, desolate, forsake |
| (verb) stop maintaining or insisting on; of ideas or claims | Synonyms: give up |
| (verb) leave behind empty; move out of | Synonyms: empty, vacate |
| (verb) forsake, leave behind | - |
| (verb) give up with the intent of never claiming again | Synonyms: give up |
| abandoned | (adjective) forsaken by owner or inhabitants | Synonyms: derelict, deserted |
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| (adjective) unrestrained and uninhibited | - |
| 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 |
| abarticulation | (noun) dislocation of a joint | - |
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| abase | (verb) cause to feel shame; hurt the pride of | Synonyms: chagrin, humble, humiliate, mortify |
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| abasement | (noun) depriving one of self-esteem | Synonyms: humiliation |
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| (noun) a low or downcast state | Synonyms: abjection, degradation |
| abash | (verb) cause to be embarrassed; cause to feel self-conscious | Synonyms: embarrass |
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| abashed | (adjective) feeling or caused to feel ill at ease or self-conscious or ashamed | Synonyms: chagrined, embarrassed |
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| abashment | (noun) feeling embarrassed due to modesty | Synonyms: bashfulness |
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| abasia | (noun) inability to walk | - |
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| abasic | (adjective) of or relating to abasia (inability to walk) | Synonyms: abatic |
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| abatable | (adjective) capable of being abated | - |
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| abate | (verb) become less in amount or intensity | Synonyms: die away, let up, slack, slack off |
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| (verb) make less active or intense | Synonyms: slack, slake |
| abatement | (noun) the act of abating | - |
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| (noun) an interruption in the intensity or amount of something | Synonyms: hiatus, reprieve, respite, suspension |
| abatic | (adjective) of or relating to abasia (inability to walk) | Synonyms: abasic |
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| abatis | (noun) a line of defense consisting of a barrier of felled or live trees with branches (sharpened or with barbed wire entwined) pointed toward the enemy | Synonyms: abattis |
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| abator | (noun) a person who abates a nuisance | - |
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| abattis | (noun) a line of defense consisting of a barrier of felled or live trees with branches (sharpened or with barbed wire entwined) pointed toward the enemy | Synonyms: abatis |
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| abattoir | (noun) a building where animals are butchered | Synonyms: butchery, shambles, slaughterhouse |
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| abaxial | (adjective) facing away from the axis of an organ or organism | Synonyms: dorsal |
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| abaxially | (adverb) in an abaxial manner | - |
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| abaya | (noun) (Arabic) a loose black robe from head to toe; traditionally worn by Muslim women | - |
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| abbacy | (noun) the jurisdiction or office of an abbot | - |
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| abbatial | (adjective) of or having to do with or belonging to an abbey or abbot, or abbess | - |
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| abbe | (noun) a French abbot | - |
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| abbess | (noun) the superior of a group of nuns | Synonyms: mother superior, prioress |
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| abbey | (noun) a monastery ruled by an abbot | - |
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| (noun) a convent ruled by an abbess | - |
| (noun) a church associated with a monastery or convent | - |
| abbot | (noun) the superior of an abbey of monks | Synonyms: archimandrite |
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| abbreviate | (verb) shorten | - |
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| (verb) reduce in scope while retaining essential elements | Synonyms: abridge, contract, cut, foreshorten, reduce, shorten |
| abbreviated | (adjective) (of clothing) very short | Synonyms: brief |
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| (adjective) cut short in duration | Synonyms: shortened, truncated |
| abbreviation | (noun) shortening something by omitting parts of it | - |
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| (noun) a shortened form of a word or phrase | - |
| abbreviator | (noun) one who shortens or abridges or condenses a written work | Synonyms: abridger |
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| abcoulomb | (noun) a unit of electrical charge equal to 10 coulombs | - |
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| abdicable | (adjective) capable of being discarded or renounced or relinquished | - |
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| abdicate | (verb) give up, such as power, as of monarchs and emperors, or duties and obligations | Synonyms: renounce |
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| 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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| abdomen | (noun) the region of the body of a vertebrate between the thorax and the pelvis | Synonyms: belly, stomach, venter |
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| (noun) the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm | Synonyms: abdominal cavity |
| abdominal | (adjective) of or relating to or near the abdomen | - |
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| (noun) the muscles of the abdomen | Synonyms: ab, abdominal muscle |
| abdominocentesis | (noun) centesis of the belly to remove fluid for diagnosis | Synonyms: paracentesis |
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| abdominoplasty | (noun) cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach | Synonyms: tummy tuck |
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| abdominous | (adjective) having a large belly | Synonyms: paunchy, potbellied |
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| abdominousness | (noun) the bodily property of a protruding belly | Synonyms: paunchiness |
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| abdominovesical | (adjective) of or relating to the abdomen and the urinary bladder | - |
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| abduce | (verb) advance evidence for | Synonyms: adduce, cite |
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| abducens | (noun) a small motor nerve supplying the lateral rectus muscle of the eye | Synonyms: abducens nerve, abducent, abducent nerve, nervus abducens, sixth cranial nerve |
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| abducent | (adjective) especially of muscles; drawing away from the midline of the body or from an adjacent part | Synonyms: abducting |
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| (noun) a small motor nerve supplying the lateral rectus muscle of the eye | Synonyms: abducens, abducens nerve, abducent nerve, nervus abducens, sixth cranial nerve |
| abduct | (verb) pull away from the body | - |
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| (verb) take away to an undisclosed location against their will and usually in order to extract a ransom | Synonyms: kidnap, nobble, snatch |
| abducting | (adjective) especially of muscles; drawing away from the midline of the body or from an adjacent part | Synonyms: abducent |
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| abduction | (noun) the criminal act of capturing and carrying away by force a family member; if a man's wife is abducted it is a crime against the family relationship and against the wife | - |
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| (noun) (physiology) moving of a body part away from the central axis of the body | - |
| abductor | (noun) a muscle that draws a body part away from the median line | Synonyms: abductor muscle |
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| (noun) someone who unlawfully seizes and detains a victim (usually for ransom) | Synonyms: kidnaper, kidnapper, snatcher |
| abeam | (adverb) at right angles to the length of a ship or airplane | - |
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| abecedarian | (adjective) alphabetically arranged (as for beginning readers) | - |
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| (noun) a novice learning the rudiments of some subject | - |
| abecedarius | (noun) a poem having lines beginning with letters of the alphabet in regular order | - |
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| abed | (adverb) in bed | - |
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| abele | (noun) a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces | Synonyms: aspen poplar, Populus alba, silver-leaved poplar, white aspen, white poplar |
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| abelia | (noun) any of various deciduous or evergreen ornamental shrubs of the genus Abelia having opposite simple leaves and cymes of small white or pink or purplish flowers; Asia and Mexico | - |
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| abelmosk | (noun) bushy herb of tropical Asia grown for its yellow or pink to scarlet blooms that resemble the hibiscus | Synonyms: Abelmoschus moschatus, Hibiscus moschatus, musk mallow |
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| aberrance | (noun) a state or condition markedly different from the norm | Synonyms: aberrancy, aberration, deviance |
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| aberrancy | (noun) a state or condition markedly different from the norm | Synonyms: aberrance, aberration, deviance |
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| aberrant | (adjective) markedly different from an accepted norm | Synonyms: deviant, deviate |
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| (noun) one whose behavior departs substantially from the norm of a group | - |
| aberrate | (verb) diverge or deviate from the straight path; produce aberration | - |
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| (verb) diverge from the expected | - |
| aberration | (noun) an optical phenomenon resulting from the failure of a lens or mirror to produce a good image | Synonyms: distortion, optical aberration |
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| (noun) a disorder in one's mental state | - |
| (noun) a state or condition markedly different from the norm | Synonyms: aberrance, aberrancy, deviance |
| abet | (verb) assist or encourage, usually in some wrongdoing | - |
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| abetalipoproteinemia | (noun) a rare inherited disorder of fat metabolism; characterized by severe deficiency of beta-lipoproteins and abnormal red blood cells (acanthocytes) and abnormally low cholesterol levels | - |
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| abetment | (noun) the verbal act of urging on | Synonyms: abettal, instigation |
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| abettal | (noun) the verbal act of urging on | Synonyms: abetment, instigation |
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| abetter | (noun) one who helps or encourages or incites another | Synonyms: abettor |
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| abettor | (noun) one who helps or encourages or incites another | Synonyms: abetter |
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| abeyance | (noun) temporary cessation or suspension | Synonyms: suspension |
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| abeyant | (adjective) inactive but capable of becoming active | Synonyms: dormant |
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| abfarad | (noun) a capacitance unit equal to one billion farads | - |
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| abhenry | (noun) a unit of inductance equal to one billionth of a henry | - |
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| abhor | (verb) find repugnant | Synonyms: abominate, execrate, loathe |
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| abhorrence | (noun) hate coupled with disgust | Synonyms: abomination, detestation, execration, loathing, odium |
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| abhorrent | (adjective) offensive to the mind | Synonyms: detestable, obscene, repugnant, repulsive |
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| abhorrer | (noun) a signer of a 1679 address to Charles II in which those who petitioned for the reconvening of parliament were condemned and abhorred | - |
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| abidance | (noun) the act of abiding (enduring without yielding) | - |
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| (noun) the act of dwelling in a place | Synonyms: residence, residency |
| (noun) acting according to certain accepted standards | Synonyms: compliance, conformation, conformity |
| abide | (verb) put up with something or somebody unpleasant | Synonyms: bear, brook, digest, endure, put up, stand, stick out, stomach, suffer, support, tolerate |
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| (verb) dwell | Synonyms: bide, stay |
| abiding | (adjective) lasting a long time | Synonyms: enduring, imperishable |
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| abience | (noun) (psychology) an urge to withdraw or avoid a situation or an object | - |
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| abient | (adjective) characterized by avoidance or withdrawal | - |
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| ability | (noun) the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment | - |
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| (noun) possession of the qualities (especially mental qualities) required to do something or get something done | Synonyms: power |