defination: engineering

The branch of science and technology concerned with the design, building, and use of engines, machines, and structures.                             ( Oxford university)

• A field of study or activity concerned with modification or development in a particular area.                                                                                   (Oxford university)
• the art or science of making practical application of the knowledge of pure sciences, as physics or chemistry, as in the construction of engine, bridges, buildings, mines, ships, and chemical plants.                                          ( dictionary. Com)
• skillful or artful contrivance; maneuvering.               ( dictionary.com).  
• the application of science and mathematics by which the properties of matter and the sources of energy in nature are made useful to people.   (Merriam Webster)
• the application of science to the goal of creating useful machines (as automobiles) or structures (as roads and dams).                             ( merriam-webster)
• The creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all as respects an intended function, economics of operation and safety to life and property. (American engineer's council for professional development)