The Collaborative International Dictionary of English v.0.48:

Visionary \Vi"sion*a*ry\, n.; pl. Visionaries.
   1. One whose imagination is disturbed; one who sees visions
      or phantoms.
      [1913 Webster]

   2. One whose imagination overpowers his reason and controls
      his judgment; an unpractical schemer; one who builds
      castles in the air; a daydreamer.
      [1913 Webster]