Dictionary.com
definitions
  • synonyms

insomnia

[in-som-nee-uh]
See more synonyms for insomnia on Thesaurus.com
noun
  1. inability to obtain sufficient sleep, especially when chronic; difficulty in falling or staying asleep; sleeplessness.
Show More

Origin of insomnia

1685–95; < Latin, equivalent to insomn(is) sleepless (in- in-3 + somn(us) sleep + -is adj. suffix) + -ia -ia
Related formsin·som·ni·ous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for insomnia

Contemporary Examples

Historical Examples


British Dictionary definitions for insomnia

insomnia

noun
  1. chronic inability to fall asleep or to enjoy uninterrupted sleepRelated adjective: agrypnotic
Show More
Derived Formsinsomnious, adjective

Word Origin

C18: from Latin, from insomnis sleepless, from somnus sleep
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for insomnia

n.

1620s, insomnie, from Latin insomnia "want of sleep," from insomnis "sleepless," from in- "not" (see in- (1)) + somnus "sleep" (see Somnus). The modern form is from 1758.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper

insomnia in Medicine

insomnia

(ĭn-sŏmnē-ə)
n.
  1. Chronic inability to fall asleep or remain asleep for an adequate length of time.
Show More
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

insomnia in Science

insomnia

[ĭn-sŏmnē-ə]
  1. Chronic inability to fall asleep or remain asleep for an adequate length of time.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

insomnia in Culture

insomnia

[(in-som-nee-uh)]

A persistent and prolonged inability to sleep.

Show More
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.