from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See sleepwalking.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. sleepwalking
from the GNU version of the Collaborative International Dictionary of English
- n. A condition of the nervous system in which an individual during sleep performs actions appropriate to the waking state; a state of sleep in which some of the senses and voluntary powers are partially awake; noctambulism.
from The Century Dictionary and Cyclopedia
- n. The act of walking about, with the performance of apparently purposive acts, while in a state intermediate between sleep and waking.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. walking by a person who is asleep
From Latin somnus ("sleep") and ambulāre ("to walk"), with the -ism suffix from Ancient Greek -ισμός, through Latin -ismus. (Wiktionary)