/ ˌhaɪpərˈæktɪv; NAmE / adjective
( especially of children and their behaviour ) too active and only able to keep quiet and still for short periods
► hyper·activ·ity / ˌhaɪpərækˈtɪvəti; NAmE / noun [ U ]
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WORD ORIGIN
mid 19th cent.: from hyper- + active .