1. Emitting or containing little or no smoke: smokeless factory stacks.
2. Free from the use of smoking tobacco or from the smoke generated by such use: a smokeless society; a smokeless office setting.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.