| decease | (noun) the event of dying or departure from life | Synonyms: death, expiry |
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| (verb) pass from physical life and lose all bodily attributes and functions necessary to sustain life | Synonyms: buy the farm, cash in one's chips, choke, conk, croak, die, drop dead, exit, expire, give-up the ghost, go, kick the bucket, pass, pass away, perish, pop off, snuff it |
| deceased | (adjective) dead | Synonyms: asleep, at peace, at rest, departed, gone |
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| (noun) someone who is no longer alive | Synonyms: dead person, dead soul, deceased person, decedent, departed |
| decedent | (noun) someone who is no longer alive | Synonyms: dead person, dead soul, deceased, deceased person, departed |
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| deceit | (noun) the act of deceiving | Synonyms: deception, dissembling, dissimulation |
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| (noun) the quality of being fraudulent | Synonyms: fraudulence |
| (noun) a misleading falsehood | Synonyms: deception, misrepresentation |
| deceitful | (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: ambidextrous, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
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| (adjective) involving deception | Synonyms: fallacious, fraudulent |
| deceitfully | (adverb) in a corrupt and deceitful manner | Synonyms: dishonestly, venally |
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| deceitfulness | (noun) the quality of being deceitful | - |
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| deceive | (verb) cause someone to believe an untruth | Synonyms: betray, lead astray |
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| (verb) be false to; be dishonest with | Synonyms: cozen, delude, lead on |
| deceiver | (noun) someone who leads you to believe something that is not true | Synonyms: beguiler, cheat, cheater, slicker, trickster |
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| deceivingly | (adverb) in a misleading way | Synonyms: deceptively, misleadingly |
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| decelerate | (verb) lose velocity; move more slowly | Synonyms: retard, slow, slow down, slow up |
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| (verb) reduce the speed of | Synonyms: slow down |
| deceleration | (noun) the act of decelerating; decreasing the speed | - |
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| (noun) a decrease in rate of change | Synonyms: retardation, slowing |
| (noun) (physics) a rate of decrease in velocity | - |
| decency | (noun) the quality of conforming to standards of propriety and morality | - |
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| (noun) the quality of being polite and respectable | - |
| decennary | (noun) a period of 10 years | Synonyms: decade, decennium |
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| decennium | (noun) a period of 10 years | Synonyms: decade, decennary |
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| decent | (adjective) conforming to conventions of sexual behavior | - |
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| (adjective) meeting requirements | Synonyms: acceptable, satisfactory |
| (adjective) observing conventional sexual mores in speech or behavior or dress | - |
| (adjective) in harmony with the spirit of particular persons or occasion | Synonyms: fitting |
| (adjective) socially or conventionally correct; refined or virtuous | Synonyms: nice |
| (adjective) sufficiently clothed to see visitors or appear in public | - |
| (adverb) in the right manner; correctly; suitably | Synonyms: decently, properly, right |
| decentalisation | (noun) the social process in which population and industry moves from urban centers to outlying districts | Synonyms: decentralization |
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| decentering | (noun) Jean Piaget's theory of cognitive development where a child slowly moves away from an egocentric world to a world shared with others. | Synonyms: decentration |
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| decently | (adverb) in a decent manner | - |
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| (adverb) in the right manner; correctly; suitably | Synonyms: decent, properly, right |
| decentralisation | (noun) the spread of power away from the center to local branches or governments | Synonyms: decentralization |
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| decentralise | (verb) make less central | Synonyms: decentralize, deconcentrate |
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| decentralised | (adjective) withdrawn from a center or place of concentration; especially having power or function dispersed from a central to local authorities | Synonyms: decentralized |
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| decentralising | (adjective) tending away from a central point | Synonyms: decentralizing |
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| decentralization | (noun) the spread of power away from the center to local branches or governments | Synonyms: decentralisation |
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| (noun) the social process in which population and industry moves from urban centers to outlying districts | Synonyms: decentalisation |
| decentralize | (verb) make less central | Synonyms: decentralise, deconcentrate |
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| decentralized | (adjective) withdrawn from a center or place of concentration; especially having power or function dispersed from a central to local authorities | Synonyms: decentralised |
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| decentralizing | (adjective) tending away from a central point | Synonyms: decentralising |
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| decentration | (noun) Jean Piaget's theory of cognitive development where a child slowly moves away from an egocentric world to a world shared with others. | Synonyms: decentering |
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| deception | (noun) the act of deceiving | Synonyms: deceit, dissembling, dissimulation |
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| (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, illusion, legerdemain, magic, magic trick, thaumaturgy, trick |
| (noun) a misleading falsehood | Synonyms: deceit, misrepresentation |
| deceptive | (adjective) designed to deceive or mislead either deliberately or inadvertently | Synonyms: misleading |
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| (adjective) causing one to believe what is not true or fail to believe what is true | Synonyms: delusory |
| deceptively | (adverb) in a misleading way | Synonyms: deceivingly, misleadingly |
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| deceptiveness | (noun) the quality of being deceptive | Synonyms: obliquity |
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| decerebrate | (verb) remove the cerebrum from (a human body) | - |
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| decertify | (verb) cause to be no longer approved or accepted | Synonyms: derecognise, derecognize |
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