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Un '''enginyer''' és un practicant [[professional]] de l'[[enginyeria]] que es dedica a aplicar el [[coneixement científic]], la [[matemàtica]] i l'[[ingenuïtat]] per trobar solucions de problemes tècnics. Els enginyers dissenyen [[ciència de materials|materials]], [[teoria d'estructures|estructures]] i sistemes tot tenint en consideració les limitacions que vénen imposades per la funcionalitat, seguretat i cost econòmic.<ref name="bls">{{cite web |author=[[Bureau of Labor Statistics]], U.S. Department of Labor |title=Engineers |work=Occupational Outlook Handbook, 2006-07 Edition |url=http://www.bls.gov/oco/ocos027.htm|accessdate=2006-09-21 |year=2006|language=anglès}}</ref><ref name="nspe"/> La paraula «enginyer» deriva de les arrels [[llatí|llatines]] ''ingeniare'' ('planejar', 'elaborar', 'idear', 'arreglar') i ''ingenium'' ('intel·ligència', 'creativitat').<ref>Oxford Concise Dictionary, 1995 (en anglès)</ref><ref>"engineer". Oxford Dictionaries. Abril de 2010. Oxford University Press (en anglès).</ref>
Engineers are grounded in [[applied science]]s, and their work in [[research and development]] is distinct from the [[basic research]] focus of [[scientist]]s.<ref name="nspe">{{cite web|author=National Society of Professional Engineers |title=Frequently Asked Questions About Engineering |url=http://www.nspe.org/media/mr1-faqs.asp|accessdate=2006-09-21 |year=2006 |archiveurl = http://web.archive.org/web/20060522214617/http://www.nspe.org/media/mr1-faqs.asp <!-- Bot retrieved archive --> |archivedate = 2006-05-22 |authorlink= National Society of Professional Engineers}} ''Science is knowledge based on observed facts and tested truths arranged in an orderly system that can be validated and communicated to other people. Engineering is the creative application of scientific principles used to plan, build, direct, guide, manage, or work on systems to maintain and improve our daily lives.''</ref> The work of engineers forms the link between scientific discoveries and their subsequent applications to human needs and quality of life.<ref name="bls" />
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