Go to MSN Homeencarta®
Dictionary
Find
in
Dictionary
Thesaurus
Translations
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Click to move up the list of words
insidious
insight
insight meditation
insigne
insignia
insignificant
insincere
insinuate
insinuating
insinuation
insipid
insist
insistent
insnare
insobriety
insofar as
insolate
Click to move down the list of words
Also available:

World English Dictionary
Dictionnaire Français

insomnia
in·som·ni·a [ in sómnee ə ]


noun 
Definition:
 
difficulty in sleeping: inability to fall asleep or to remain asleep long enough to feel rested, especially when this is a problem that continues over time
[Early 17th century. < Latin< insomnis "sleepless" < somnus "sleep"]

in·som·ni·ac adjective, noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
Advertisement
© 2009 Microsoft