work·ing 
(wûrkĭng)
(wûrkĭng)adj.
1.
a. Performing work: a working committee.
b. Operating or functioning as required: a working flashlight.
2. Having a paying job; employed: working mothers.
3.
a. Spent at work: a working life of 40 years.
b. Taken while continuing to work: a working vacation.
4.
a. Sufficient to allow action: a working majority.
b. Adequate for practical use: a working knowledge of Spanish.
5. Serving as a basis or guide for further work: a working hypothesis.
n. often workings
1. The manner in which something operates or functions: the workings of the mind.
2. The parts of a mine or quarry that have been or are being excavated.