a person who dreams.
a person who lives in a world of fantasy; one who is impractical and unrealistic.
a person whose ideas or projects are considered audacious or highly speculative; visionary.

1250–1300; Middle English. See dream, er1

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World English Dictionary
dreamer (ˈdriːmə)
1.  a person who dreams habitually
2.  a person who lives in or escapes to a world of fantasy or illusion; escapist
3.  archaic a prophet; visionary

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, "one who dreams," agent noun from from dream. Meaning "idler, daydreamer" emerged by 1530s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
At the northeastern border of the park is the former home of another dreamer.
Sam appears to be a dreamer lost in his imaginary world, but still with good
  business and people manipulation skills.
Others label him a dreamer, or worse, a pyramid buff with loony ideas.
Though it may seem a stretch to suggest that the mind of a dreamer could be
  read in this way, it is not.
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