from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An intermediate shaft between the powered and driven shafts in a belt drive.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A jackshaft.
from the GNU version of the Collaborative International Dictionary of English
- n. An intermediate shaft; esp., one which receives motion from a line shaft in a factory and transmits it to a machine.
from The Century Dictionary and Cyclopedia
- n. A shaft driven by a band or gearing running from another opposite and parallel shaft.
counter- + shaft (Wiktionary)