| defiance | (noun) a defiant act | - |
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| (noun) intentionally contemptuous behavior or attitude | Synonyms: rebelliousness |
| (noun) a hostile challenge | - |
| defiant | (adjective) boldly resisting authority or an opposing force | Synonyms: noncompliant |
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| defiantly | (adverb) in a rebellious manner | Synonyms: contumaciously, rebelliously |
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| defibrillate | (verb) stop the fibrillation and restore normal contractions, usually by means of electric shocks | - |
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| defibrillation | (noun) treatment by stopping fibrillation of heart muscles (usually by electric shock delivered by a defibrillator) | - |
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| defibrillator | (noun) an electronic device that administers an electric shock of preset voltage to the heart through the chest wall in an attempt to restore the normal rhythm of the heart during ventricular fibrillation | - |
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| defibrinate | (verb) remove fibrin from (blood) | - |
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| deficiency | (noun) lack of an adequate quantity or number | Synonyms: inadequacy, insufficiency |
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| (noun) the state of needing something that is absent or unavailable | Synonyms: lack, want |
| deficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: insufficient |
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| (adjective) inadequate in amount or degree | Synonyms: lacking, wanting |
| (adjective) falling short of some prescribed norm | Synonyms: inferior, substandard |
| deficit | (noun) the property of being an amount by which something is less than expected or required | Synonyms: shortage, shortfall |
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| (noun) an excess of liabilities over assets (usually over a certain period) | - |
| (noun) (sports) the score by which a team or individual is losing | - |
| (noun) a deficiency or failure in neurological or mental functioning | - |
| defilade | (noun) the arrangement of defensive fortifications to protect against enemy fire | - |
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| defile | (noun) a narrow pass (especially one between mountains) | Synonyms: gorge |
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| (verb) spot, stain, or pollute | Synonyms: befoul, foul, maculate |
| (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: maculate, stain, sully, tarnish |
| (verb) place under suspicion or cast doubt upon | Synonyms: cloud, corrupt, sully, taint |
| defiled | (adjective) morally blemished; stained or impure | Synonyms: maculate |
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| defilement | (noun) the state of being polluted | Synonyms: befoulment, pollution |
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| defiler | (noun) a person or organization that causes pollution of the environment | Synonyms: polluter |
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| definability | (noun) the quality or state of being capable of being defined, limited, or explained. | - |
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| definable | (adjective) capable of being defined, limited, or explained | - |
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| define | (verb) give a definition for the meaning of a word | - |
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| (verb) decide upon or fix definitely | Synonyms: determine, fix, limit, set, specify |
| (verb) determine the essential quality of | Synonyms: delimit, delimitate, delineate, specify |
| (verb) determine the nature of | - |
| (verb) show the form or outline of | Synonyms: delineate |
| defined | (adjective) clearly characterized or delimited | - |
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| (adjective) showing clearly the outline or profile or boundary | Synonyms: outlined |
| defining | (noun) any process serving to define the shape of something | Synonyms: shaping |
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| definite | (adjective) precise; explicit and clearly defined | - |
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| (adjective) known for certain | - |
| definitely | (adverb) without question and beyond doubt | Synonyms: by all odds, decidedly, emphatically, in spades, unquestionably |
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| definiteness | (noun) the quality of being predictable with great confidence | Synonyms: determinateness |
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| definition | (noun) clarity of outline | - |
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| (noun) a concise explanation of the meaning of a word or phrase or symbol | - |
| definitive | (adjective) supplying or being a final or conclusive settlement | Synonyms: determinate |
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| (adjective) clearly defined or formulated | Synonyms: unequivocal |
| (adjective) of recognized authority or excellence | Synonyms: authoritative |
| definitors | (noun) council in a religious order who provide counsel and assistance to the superiors general and provincial superior of their order. | - |
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| immunodeficiency | (noun) immunological disorder in which some part of the body's immune system is inadequate and resistance to infectious diseases is reduced | - |
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| immunodeficient | (adjective) incapable of developing an immune response following exposure to an antigen | - |
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| indefinability | (noun) The quality of not being able to be precisely defined or put into words. | - |
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| indefinable | (adjective) defying expression or description | Synonyms: indescribable, ineffable, unspeakable, untellable, unutterable |
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| (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: undefinable |
| indefinite | (adjective) vague or not clearly defined or stated | - |
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| (adjective) not decided or not known | - |
| indefinitely | (adverb) to an indefinite extent; for an indefinite time | - |
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| indefiniteness | (noun) the quality of being vague and poorly defined | Synonyms: indefinity, indeterminacy, indeterminateness, indetermination |
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| indefinity | (noun) the quality of being vague and poorly defined | Synonyms: indefiniteness, indeterminacy, indeterminateness, indetermination |
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| redefine | (verb) give a new or different definition of (a word) | - |
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| (verb) give a new or different definition to | - |
| redefinition | (noun) the act of giving a new definition | - |
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| spadefish | (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: angelfish, Chaetodipterus faber |
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| undefiled | (adjective) (of language) not having its purity or excellence debased | Synonyms: uncorrupted |
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| (adjective) free from stain or blemish | Synonyms: immaculate |
| undefinable | (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: indefinable |
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| undefined | (adjective) not precisely limited, determined, or distinguished | Synonyms: vague |
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