Source : Webster's Revised Unabridged Dictionary (1913)

Designer \De*sign"er\, n.
   1. One who designs, marks out, or plans; a contriver.

   2. (Fine Arts) One who produces or creates original works of
      art or decoration.

   3. A plotter; a schemer; -- used in a bad sense.

Source : WordNet®

designer
     n 1: a person who specializes in designing architectural
          interiors and their furnishings [syn: {interior designer},
           {interior decorator}, {house decorator}, {room
          decorator}, {decorator}]
     2: someone who creates plans to be used in making something
        (such as buildings) [syn: {architect}]
     3: a person who devises plots or intrigues; "he is believed to
        be the principal designer of the terrorist bombing attack"
        [syn: {intriguer}]
     4: someone who designs clothing [syn: {couturier}, {fashion
        designer}, {clothes designer}]