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insomnia

[in-som-nee-uh] /ɪnˈsɒm ni ə/
noun
1.
inability to obtain sufficient sleep, especially when chronic; difficulty in falling or staying asleep; sleeplessness.
Origin
1685-1695
1685-95; < Latin, equivalent to insomn(is) sleepless (in- in-3 + somn(us) sleep + -is adj. suffix) + -ia -ia
Related forms
insomnious, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for insomnia

insomnia

/ɪnˈsɒmnɪə/
noun
1.
chronic inability to fall asleep or to enjoy uninterrupted sleep related adjective agrypnotic
Derived Forms
insomnious, 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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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insomnia in Medicine

insomnia in·som·ni·a (ĭn-sŏm'nē-ə)
n.
Chronic inability to fall asleep or remain asleep for an adequate length of time.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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insomnia in Science
insomnia
  (ĭn-sŏm'nē-ə)   
Chronic inability to fall asleep or remain asleep for an adequate length of time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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insomnia in Culture
insomnia [(in-som-nee-uh)]

A persistent and prolonged inability to sleep.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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