Definitions

Engineer is...

1.One who is trained or professionally engaged in a branch of engineering.
2.One who operates an engine.
3.One who skillfully or shrewdly manages an enterprise.

tr.v., -neered, -neer·ing, -neers.
1.To plan, construct, or manage as an engineer.
2.To alter or produce by methods of genetic engineering: “Researchers . . . compared insulin manufactured by bacteria genetically engineered with recombinant DNA techniques to the commercial insulin obtained from swine or cattle” (Fusion).
3.To plan, manage, and put through by skillful acts or contrivance; maneuver.
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A person trained and experienced in the profession of engineering; a person licensed to practice the profession by the authority in the area.
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A person who works to use power and resources in ways that are useful. Also: A person who runs a train.