from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. In a manner that is sustained as long as or beyond a note's full value. Used chiefly as a direction.
- n. A sostenuto passage or movement.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. played in a sustained manner beyond the notes normal value
- n. A note or passage marked to be sustained
from the GNU version of the Collaborative International Dictionary of English
- adj. Sustained; -- applied to a movement or passage the sounds of which are to sustained to the utmost of the nominal value of the time; also, to a passage the tones of which are to be somewhat prolonged or protacted.
from The Century Dictionary and Cyclopedia
- In music, sustained; prolonged: sometimes merely the same as tenuto, and sometimes implying in addition a slight reduction of speed. Abbreviated sost.
Italian, past participle of sostenere, to sustain, from Latin sustinēre; see sustain.(American Heritage® Dictionary of the English Language, Fourth Edition)