Source : Webster's Revised Unabridged Dictionary (1913)

Invention \In*ven"tion\, n. [L. inventio: cf. F. invention. See
   {Invent}.]
   1. The act of finding out or inventing; contrivance or
      construction of that which has not before existed; as, the
      invention of logarithms; the invention of the art of
      printing.

Source : WordNet®

invention
     n 1: the creation of something in the mind [syn: {innovation}, {excogitation},
           {conception}, {design}]
     2: a creation (a new device or process) resulting from study
        and experimentation [syn: {innovation}]
     3: the act of inventing