Source : Webster's Revised Unabridged Dictionary (1913)

Engineer \En`gi*neer"\, n. [OE. enginer: cf. OF. engignier, F.
   ing['e]nieur. See {Engine}, n.]
   1. A person skilled in the principles and practice of any
      branch of engineering. See under {Engineering}, n.

   2. One who manages as engine, particularly a steam engine; an
      engine driver.

   3. One who carries through an enterprise by skillful or
      artful contrivance; an efficient manager. [Colloq.]

   {Civil engineer}, a person skilled in the science of civil
      engineering.

   {Military engineer}, one who executes engineering works of a
      military nature. See under {Engineering}.

Source : WordNet®

civil engineer
     n : an engineer trained to design and construct and maintain
         public works (roads or bridges or harbors etc.)