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Definition of Insomnia
1. Noun. An inability to sleep; chronic sleeplessness.
Definition of Insomnia
1. n. Want of sleep; inability to sleep; wakefulness; sleeplessness.
Definition of Insomnia
1. chronic inability to sleep [n -S]
Medical Definition of Insomnia
1. Inability to sleep, abnormal wakefulness. Origin: L. Somnus = sleep This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)