From The Collaborative International Dictionary of English v.0.48 [gcide]:
Abracadabra \Ab'ra*ca*dab"ra\, noun [L. Of unknown origin.] A mystical word or collocation of letters written as in the figure. Worn on an amulet it was supposed to ward off fever. At present the word is used chiefly in jest to denote something without meaning; jargon.
From WordNet (r) 3.0 (2006) [wn]:
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