Technology, the application of scientific knowledge to the practical aims of human life or, as it is sometimes phrased, to the change and manipulation of the human environment. the subject of technology is treated in a number of articles. for general treatment, see technology, history of; hand tool. 1 a : the practical application of knowledge especially in a particular area : engineering sense 2 medical technology b : a capability given by the practical application of knowledge a car's fuel saving technology 2 : a manner of accomplishing a task especially using technical processes, methods, or knowledge. brings you the latest images, videos and news from america's space agency. get the latest on all things technology related from nasa. Technology bbc news more tech tech lay offs: dell to cut workforce dell adds to the growing list of technology companies cutting jobs as consumer and corporate spending shrinks. 2h. The definition of technology is the application of scientific knowledge for practical purposes or applications. technology uses scientific principles, and applies them to change the environment.