"The specialty of engineering is a learned discipline involving the systematic approach to changing the physical world in response to certain kinds of imperatives that are knowledge deficient and values deficient. Particularly exigent imperatives."
My paraphrase of Taft Broome's definition of engineering:
Broome, Taft. "20: Ethical Terminology." MIT OpenCourseWare. Massachusetts Institute of Technology, n.d. Web. 18 Aug. 2014. <http://ocw.mit.edu/courses/engineering-systems-division/esd-932-engineering-ethics-spring-2006/audio-lectures/20-ethical-terminology/>. Audio Lecture