One of the most important concepts that I learned in college was a very specific definition of the word "engineering." I don't remember exactly where I first heard this definition, but I seem to recall it was an offhand remark made about the profession by a seminar lecturer. I like it because it is simple yet comprehensive in how it can be applied. Here is my definition of engineering:
Engineering is the use of math, science, and technology to optimize a solution to a problem.
There is a tool set that we use – math, science, and technology – to solve a problem in an optimized way. The focus is on a solution and the tool set makes it the best solution.