engineer -
A person trained in a natural science that applies such knowledge towards a practical objective.
engineer -
A person who, given a practical scientific problem involving the physical world and a specific set of goals and constraints, finds a technical solution to the problem that satisfies those goals within those constraints. The goals and constraints may be technical, social, or business related.
An engineer is a professional practitioner of engineering, concerned with applying scientific knowledge, mathematics and ingenuity to develop solutions for technical problems. Engineers design materials, structures, machines and systems while considering the limitations imposed by practicality, safety and cost. The word engineer is derived from the Latin root ingenium, meaning "cleverness".
OmegaWiki Dictionary
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engineer A person who uses scientific knowledge to solve practical problems.