[1] : The Collaborative International Dictionary of English v.0.48

quixotism \quix"otism\ kwi^ks"o^ti^z'm, n.
   that form of delusion which leads to extravagant and absurd
   undertakings or sacrifices in obedience to a morbidly
   romantic ideal of duty or honor, as illustrated by the
   exploits of don quixote in knight-errantry. see quixotic.
   1913 webster
see also:
quixotic 

[2] : WordNet (r) 2.0

quixotism
     n : quixotic romantic and impractical behavior syn: knight
         errantry
see also:
knight errantry 

Quixotism >> Q Words
Quixotism, definition of term: Quixotism
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