Performing work: a working committee. Operating or functioning as required: a working flashlight. Having a paying job; employed: working mothers. Spent at work: a working life of 40 years. Taken while continuing to work: a working vacation. Sufficient to allow action: a working majority. Adequate for practical use: a working knowledge of Spanish. Serving as a basis or guide for further work: a working hypothesis. The manner in which something operates or functions. Often used in the plural: the workings of the mind. The parts of a mine or quarry that have been or are being excavated. Often used in the plural.