visionary

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Characterized by vision or foresight.
• adjective Having the nature of fantasies or dreams; illusory.
• adjective Existing in imagination only; imaginary.
• adjective Characterized by or given to apparitions, prophecies, or revelations.
• adjective Given to daydreams or reverie; dreamy.
• adjective Not practicable or realizable; utopian.
• adjective Tending to envision things in perfect but unrealistic form; idealistic.
• noun One who is given to impractical or speculative ideas; a dreamer.
• noun One who has visions; a seer.

from The Century Dictionary.

• Apt to behold visions: of powerful and foreseeing imagination; imaginative; in a bad sense, apt to receive and act on mere fancies or whims as if they were realities; given to indulging in day-dreams, reveries, fanciful theories, or the like.
• Of or pertaining to visions; of the nature of a vision or a product of the imagination; imaginary; in a bad sense, having no real basis; not founded on fact or possibility; impracticable; impossible: as, a visionary scheme.
• Appropriate to or characterized by the appearance of visions.
• Synonyms Imaginative, romantic.
• Unreal, fancied, ideal, illusory, utopian, chimerical.
• noun One who sees visions; one who lives in the imagination.
• noun One who forms impracticable schemes; one who is given to idle and fanciful projects.
• noun Synonyms Dreamer, enthusiast.

from the GNU version of the Collaborative International Dictionary of English.

• noun One whose imagination is disturbed; one who sees visions or phantoms.
• noun One whose imagination overpowers his reason and controls his judgment; an unpractical schemer; one who builds castles in the air; a daydreamer.
• adjective Of or pertaining to a visions or visions; characterized by, appropriate to, or favorable for, visions.
• adjective Affected by phantoms; disposed to receive impressions on the imagination; given to reverie; apt to receive, and act upon, fancies as if they were realities.
• adjective Existing in imagination only; not real; fanciful; imaginary; having no solid foundation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective having vision or foresight
• adjective imaginary or illusory
• adjective prophetic or revelatory
• adjective idealistic or utopian
• noun someone who has visions; a seer
• noun an impractical dreamer
• noun someone who has positive ideas about the future

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective not practical or realizable; speculative
• noun a person given to fanciful speculations and enthusiasms with little regard for what is actually possible
• noun a person with unusual powers of foresight