Engineer 

An engineer is a professional practitioner of engineering, concerned with applying scientific knowledge, mathematics and ingenuityto develop solutions for technical, social and economic problems. Engineers design materials, structures and systems while considering the limitations imposed by practicality, safety and cost. The word engineer is derived from the Latin roots ingeniare("to contrive, devise") and ingenium ("cleverness").

Engineers are grounded in applied sciences, and their work in research and development is distinct from the basic research focus ofscientists. The work of engineers forms the link between scientific discoveries and their subsequent applications to human needs and quality of life.