Som‐nam″bu‐lism (?), n. [Cf. F. somnambulisme. See Somnambulation.] 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.