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left: C note without acciaccatura
bottom: C note with acciaccatura
An ornament note that is one half step or one whole step higher or lower than a principal note and is sounded at the same time as the principal note, adding dissonance to a harmony.
[Italian, a crushing, acciaccatura, from acciaccare, to crush, weaken, from acciacco, ailment, from Spanish achaque, ailment, defect, excuse, from achacar, to blame, from Arabic al-šakwa, the complaint : al-, the + šakwa, complaint, grievance (from šakā, to complain, suffer).]
n, pl -ras or -re (-reɪ; -riː)
1. (Classical Music) a small grace note melodically adjacent to a principal note and played simultaneously with or immediately before it
2. (Classical Music) (in modern music) a very short appoggiatura
[C18: Italian: literally, a crushing sound]
ac•ciac•ca•tu•ra(əˌtʃɑ kəˈtʊər ə)
n., pl. -tu•ras, -tu•re (-ˈtʊər eɪ, -ˈtʊər i)
a short grace note one half step below, and struck at the same time as, a principal note.