Breadcrumb Home > Dictionary > Index I insomnia: Meaning and Definition of Find definitions for: in•som•ni•a Pronunciation: (in-som'nē-u), [key] — n. inability to obtain sufficient sleep, esp. when chronic; difficulty in falling or staying asleep; sleeplessness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: insomnia (Thesaurus) insolvent insomniac ✖ Related Content Daily Word Quiz: nomdeguerre Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language