Definition of hyperactivity
1 : the state or condition of being overly active <Canada geese are disarmingly expressive. … They disdain the frantic hyperactivity of smaller birds. — Benjamin B. Bachman>
2 : increased levels of function or activity especially when considered abnormally excessive <She had developed delusions of invincibility, along with bouts of hyperactivity and severe insomnia. — Per Ola and Emily DȧAulaire>; especially : higher than usual levels of movement and activity (such as excessive talking or fidgeting) typically associated with attention deficit disorder <An estimated 1 in 50 school-age children in the United States, receive stimulant medication to help quell inattentiveness and hyperactivity. — Christine Mlot>
First Known Use of hyperactivity
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