单词	retardations
释义	retardation noun re·​tar·​da·​tion ˌrē-ˌtär-ˈdā-shən  ri- 1 : an act or instance of retarding 2 : the extent to which something is retarded 3 : a musical suspension specifically : one that resolves upward 4 a(1) : an abnormal slowness of thought or action psychomotor retardation (2) now usually offensive : intellectual disability b : slowness in development or progress fetal growth retardation Synonyms braking deceleration downshift letup slowdown See all Synonyms & Antonyms Example Sentences The child suffered severe mental retardation. The chemical induced a retardation of cell growth. Recent Examples on the Web The Everrati's left pedal operates pads on discs in the normal fashion, but the motors also give powerful regenerative retardation when the accelerator is lifted. Mike Duff, Car and Driver, 18 June 2021 The Vantage’s brake pedal has a nice firm weight but little travel, retardation being down to pressure rather than movement. Mike Duff, Car and Driver, 28 Feb. 2018 The policy of retardation of submarine technology ended right after the beginning of the Anglo-German naval race (marked by the German Naval Laws of 1898 and 1900). chicagotribune.com, 28 July 2017 At the end Austen had psychomotor retardation and could barely move. Rene Chun, Los Angeles Magazine, 19 June 2017 The front wheels threaten to lock up under what feels like normal levels of retardation at low speeds. Mike Duff, Car and Driver, 30 June 2017 Word History First Known Use 15th century, in the meaning defined at sense 1 Medical Definition retardation noun re·​tar·​da·​tion ˌrē-ˌtär-ˈdā-shən, ri-  1 a : an abnormal slowness of thought or action psychomotor retardation b now usually offensive : intellectual disability 2 : slowness in development or progress fetal growth retardation retardations noun plural of retardation as in decelerations a usually gradual decrease in the pace or level of activity of something scientists discovered that they could achieve the retardation of light if they shined it through a variety of substances Synonyms & Similar Words Relevance decelerations slowdowns declines drops letups slumps downshifts stoppages remissions plunges collapses arrests falls retreats halts ebbs crashes wanes checks Antonyms & Near Antonyms accelerations
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