Antonym: acceleration. Similar words: retardant, retaliation, retard, retarded, interpretation, predation, gradation, emendation. Meaning: [‚rɪːtɑr'deɪʃn /-tɑː'd-] 
n. 1. a decrease in rate of change 2. the extent to which something is delayed or held back 3. any agent that retards or delays or hinders 4. lack of normal development of intellectual capacities 5. the act of slowing down or falling behind.
n. 1. a decrease in rate of change 2. the extent to which something is delayed or held back 3. any agent that retards or delays or hinders 4. lack of normal development of intellectual capacities 5. the act of slowing down or falling behind. 
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61. Adaptive behavior and intelligence are the two criteria for diagnosing and classifying people with mental retardation.
62. Abnormal imprinting effects are associated with clinical disorders of overgrowth, undergrowth, mental retardation, or behavior abnormalities.
63. Williams syndrome is marked by heart defects, mental retardation, and a lack of social anxiety that produces exceedingly friendly human beings.
64. Psychology The state or condition of being an imbecile; moderate or severe mental retardation.
65. Most children with Down syndrome have mild - to - moderate mental retardation.
66. Based on the total-reflection phase transformation theory, the Fresnel rhomb retarder is obtained with a structure angle with which the phase retardation is insensitive to the angle of incidence.
67. Aberration and retardation effects are also taken into account when calculating pulse phase, colatitude angle and position angle.
68. Conclusion Acute exposure to lead may impact mice behavior altering such as irritability, hyperkinesis, retardation of learning and memory, etc.
69. The IQ test alone does not determine whether someone is mental retardation.
70. The report says that 79% of parents and 80% of non-parents incorrectly associate mental retardation with a learning disorder.
71. According to BPRS factor analysis, the retardation, activation and hostile suspiciousness was more obvious than other factors.
72. The suggestion of development and extent of fire retardation PP was made.
73. Fortunately, an easy form of protection is potassium iodide, a simple compound typically added to table salt to prevent goiter and a form of mental retardation caused by a dietary lack of iodine.
74. Objective: To investigate the comparative efficacy of fluoxetine versus trazodone in depression with remarkable retardation and lack of energy.
75. Complication: There were 22 cases of drooling, 19 of strabism, 26 of language disorder, 12 of obvious mental retardation, 5 cases of epilepsy, 7 of adductor disruption, and 1 of torsion spasm.
76. Probed the effect of the content of guanylurea phosphate and the soaking time on flame retardation, at the same time the treated insulated paper was studied by thermal analysis.
77. Cohen syndrome has several characteristics such as obesity(sentencedict.com/retardation.html), mental retardation and craniofacial dysmorphism .
78. Objective To detect the expression of matrix metalloproteinase-9(MMP-9) in the syncytiotrophoblast, and to investigate the role of MMF-9 in patients with intrauterine growth retardation(IUGR).
79. Furthermore, a coupon test is carried out to ensure the correction and determinate the unknown parameter R(subscript so) in retardation model corresponding baseline operational spectrum.
80. The theory confirms the increase in the retardation effect with decrease in particle size.
81. Due to the surface retardation, the attenuation rate of velocity becomes quicker, which depends on water depth and jet width.
82. Aim To study the modes of inheritance of mental retardation for integrate control in Ankang experimental station.
83. But when it was all said and done he wasn't blind, he wasn't deaf, didn't lose language, didn't become aphasic, no paralysis, no retardation.
84. Tissue membrane is the retardation cingulum of dust transference in vivo.
85. The second part is the relation between universal design of signage and persons with mental retardation.
86. Conclusion Rapists who raped the women with mental retardation related to mental subnormality , their intelligence construcion is also abnormal.
87. The stimulus fading strategy was effective on functional vocabulary generalization for students with moderate mental retardation.
88. The risk of low birth weight and intra-uterine retardation increases for babies of mothers who smoke.
89. Iodine deficiency disorders will lead to goiter hypothyroidism , mental retardation, cretinism, and so on.
90. Objective To explore the etiology of mental retardation, amenorrhea , abnormal childbearing history and abnormal sexual appearance.
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