A higher than normal level of activity. An organ can be described as hyperactive if it is more active than is usual. Behavior can also be described as hyperactive.
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1. SYN: superactivity. 2. General restlessness or excessive movement such as that characterizing children with attention deficit disorder or hyperkinesis.

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hy·per·ac·tiv·i·ty .hī-pə-.rak-'tiv-ət-ē n, pl -ties a state or condition of being excessively or pathologically active esp ATTENTION DEFICIT DISORDER

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hy·per·ac·tiv·i·ty (hi″pər-ak-tivґĭ-te) 1. excessive or abnormally increased muscular function or activity. 2. former name for, but now one of the signs of, attention-deficit/hyperactivity disorder.

Medical dictionary. 2011.

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