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Illusory; unreal: "One wonders if historians ... are caught up in an Alice-in-Wonderland world of their own making" (Zara Steiner).
[Short for Alice's Adventures in Wonderland, , fantasy novel by Lewis Carroll.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
[C20: alluding to the absurdities of Wonderland in Lewis Carroll's book]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
resembling a dream or fantasy; unreal.
[1920–25; alluding to Lewis Carroll's children's story Alice's Adventures in Wonderland (1865)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.