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English - English (Wordnet) dictionary (also found in English - Vietnamese, )
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  • the act of slowing down or falling behind
  • lack of normal development of intellectual capacities
  • any agent that retards or delays or hinders
    • flame-retardant
  • the extent to which something is delayed or held back
  • a decrease in rate of change
    • the deceleration of the arms race
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