1. 1. Performing work: a working committee.
   2. Operating or functioning as required: a working flashlight.
2. Having a paying job; employed: working mothers.
3. 1. Spent at work: a working life of 40 years.
   2. Taken while continuing to work: a working vacation.
4. 1. Sufficient to allow action: a working majority.
   2. Adequate for practical use: a working knowledge of Spanish.
5. Serving as a basis or guide for further work: a working hypothesis.

1. The manner in which something operates or functions. Often used in the plural: the workings of the mind.
2. The parts of a mine or quarry that have been or are being excavated. Often used in the plural.

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.