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From The Collaborative International Dictionary of English v.0.48:
Quixotism \Quix"ot*ism\ (kw[i^]ks"[o^]t*[i^]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]