given to or characterized by fanciful, not presently workable, or unpractical ideas, views, or schemes: a visionary enthusiast.
given to or concerned with seeing visions.
belonging to or seen in a vision.
unreal; imaginary: visionary evils.
purely idealistic or speculative; impractical; unrealizable: a visionary scheme.
of, pertaining to, or proper to a vision.
noun, plural visionaries.
a person of unusually keen foresight.
a person who sees visions.
a person who is given to audacious, highly speculative, or impractical ideas or schemes; dreamer.

1640–50; vision + -ary

visionariness, noun
nonvisionary, adjective, noun
unvisionary, adjective

1. impractical, impracticable. 4. fancied, illusory, chimerical. 5. unrealistic.

1. practical. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
visionary (ˈvɪʒənərɪ)
1.  marked by vision or foresight: a visionary leader
2.  incapable of being realized or effected; unrealistic
3.  (of people) characterized by idealistic or radical ideas, esp impractical ones
4.  given to having visions
5.  of, of the nature of, or seen in visions
n , -aries
6.  a visionary person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"able to see visions," 1651, from vision (q.v.). Meaning "impractical" is attested from 1727. The noun is attested from 1702, from the adj., originally "one who indulges in impractical fantasies."
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

visionary definition

1. One who hacks vision, in the sense of an Artificial Intelligence researcher working on the problem of getting computers to "see" things using TV cameras. (There isn't any problem in sending information from a TV camera to a computer. The problem is, how can the computer be programmed to make use of the camera information? See SMOP, AI-complete.)
2. [IBM] One who reads the outside literature. At IBM, apparently, such a penchant is viewed with awe and wonder.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Visionary leader knows best practices for urban, commuter, community and
  technical college students.
Left in place, she would have been the beneficiary of her own visionary
Around the central character swirls a cast of cheats, anarchists, and visionary
  urban promoters.
We asked the visionary scientists on our advisory board what new trends will
  shape the decades to come.
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