The Collaborative International Dictionary of English v.0.48:

Inventor \In*vent"or\, n. [L.: cf. F. inventeur.]
   One who invents or finds out something new; a contriver;
   especially, one who invents mechanical devices, new drugs,
   new processes, or other useful objects or procedures.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

inventor
    n 1: someone who is the first to think of or make something
         [syn: inventor, discoverer, artificer]

The Devil's Dictionary (1881-1906):

INVENTOR, n.  A person who makes an ingenious arrangement of wheels,
levers and springs, and believes it civilization.