From The Collaborative International Dictionary of English v.0.48 [gcide]:
Acciaccatura \Ac*ciac'ca*tu"ra\, noun [It., from acciaccare to crush.] (Mus.) A short grace note, one semitone below the note to which it is prefixed; -- used especially in organ music. Now used as equivalent to the short appoggiatura.
From WordNet (r) 3.0 (2006) [wn]:
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