Meaning of sostenuto

sos•te•nu•to

Pronunciation: (sos"tu-n'tō, sō"stu-It.sôs"te-n'tô), [key]
— adj., n., pl. -tos, -ti
—adj.
  1. sustained or prolonged in the time value of the tones.
—n.
  1. a movement or passage played in this manner.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.