Oh fuck off. Let me settle the matter once and for all:

> Engineering is the application of mathematics and scientific, economic, social, and practical knowledge in order to invent, innovate, design, build, maintain, research, and improve structures, machines, tools, systems, components, materials, processes, solutions, and organizations.

edit: This post got flagged and I can see that OP is new to the board. I'm sorry for my tone here.

already discussed, https://news.ycombinator.com/item?id=13850516