[ som-nam-byuh-leyt, suh m- ]
/ sɒmˈnæm byəˌleɪt, səm- /

verb (used without object), som·nam·bu·lat·ed, som·nam·bu·lat·ing.

to walk during sleep; sleepwalk.

Origin of somnambulate

1825–35; < Latin somn(us) sleep + ambulate

Related forms

som·nam·bu·lant, adjective, nounsom·nam·bu·la·tion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for somnambulation

  • The cataleptic spasm which preceded the reverie and somnambulation in the patient, whose case is related in Sect.

    Zoonomia, Vol. II|Erasmus Darwin
  • This mental effort is termed reverie, or somnambulation, and is described more at large in Sect.

    Zoonomia, Vol. I|Erasmus Darwin

British Dictionary definitions for somnambulation


/ (sɒmˈnæmbjʊˌleɪt) /


(intr) to walk while asleep

Derived Forms

somnambulance, nounsomnambulant, adjective, nounsomnambulation, nounsomnambulator, noun

Word Origin for somnambulate

C19: from Latin somnus sleep + ambulāre to walk
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