Engineer ; from Wikipedia

1. An engineer is an engineering professional.
2. Engineers are concerned with developing economical and safe solutions to practical problems, by applying mathematics and scientific knowledge while considering technical constraints.
3. The term is derived from the Latin root "ingenium," meaning "cleverness".
4. The industrial revolution and continuing technological developments of the last few centuries have changed the connotation of the term slightly, resulting in the perception of engineers as applied scientists.
5. The work of engineers is the link between perceived needs of society and commercial applications.