Business
Business is the activity of making one's living or making money by producing or buying and selling goods or services. Simply put, it is "any activity or enterprise entered into for profit. It does not mean it is a company, a corporation, partnership, or have any such formal organization, but it can range from a street peddler to General Motors." The term is also often used colloquially (but not by lawyers or public officials) to refer to a company, but this article will not deal with that sense of the word.
Engineering
Engineering is the creative application of science, mathematical methods, and empirical evidence to the innovation, design, construction, operation and maintenance of structures, machines, materials, devices, systems, processes, and organizations. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering.
Process
A process is a set of activities that interact to achieve a result.
Process Engineering
Process engineering focuses on the design, operation, control, optimization and intensification of chemical, physical, and biological processes. Process engineering encompasses a vast range of industries, such as chemical, petrochemical, agriculture, mineral processing, advanced material, food, pharmaceutical, software development, automotive, and biotechnological industries. The application of systematic computer-based methods to process engineering is "process systems engineering".
Engineering
Only among those who were engaged in a particular activity did their language remain unchanged; so, for instance, there was one for all the architects, one for all the carriers of stones, one for all the stone-breakers, and so on for all the different operations. As many as were the types of work involved in the enterprise, so many were the languages by which the human race was fragmented; and the more skill required for the type of work, the more rudimentary and barbaric the language they now spoke. But the holy tongue remained to those who had neither joined in the project nor praised it, but instead, thoroughly disdaining it, had made fun of the builders' stupidity.
Dante Alighieri, De vulgari eloquentia, Chapter VII
Business
However successful a man may be in his own business, if he turns from that and engages ill a business which he don't understand, he is like Samson when shorn of his locks his strength has departed, and he becomes like other men.
P. T. Barnum, 'Beware of Outside Operations', The Art of Money Getting (1880).
Engineering
Engineering is the conscious application of science to the problem of economic production.
Halbert Powers Gillette (1910). cited in: T.J. Hoover & J.C. Lounsbury Fish. The Engineering Profession. Stanford University Press, 1941. p. 463