Engineer: 1. a person skilled in branch of engineering. 2. Person who makes or in charge of engine. 3. Person who design and construct Engineering: Application of Science to design, build and uses of machines. Categories: Agriculture Engineer, Civil Engineer, Genetic Engineer, Mining engineer, Aeronautical Engineer, Mechanical, Electrical, Electronic and many others......... DR: Qualified practitioner of Medicine P.HD: Highest degree of University called an expert of a particular field. Now justify the terminology of Engineer