The Collaborative International Dictionary
Sixty-fourth \Six`ty-fourth"\, a. Constituting or being one of sixty-four equal parts into which a thing is divided.
Sixty-fourth note (Mus.), the sixty-fourth part of a whole note; a hemi-demi-semiquaver.
Wiktionary
alt. (context music English) a note with 1/64 the value of a whole note n. (context music English) a note with 1/64 the value of a whole note
WordNet
n. a musical note having the time value of a sixty-fourth of a whole note [syn: hemidemisemiquaver]
Wikipedia
In music notation, a sixty-fourth note (American), or hemidemisemiquaver or semidemisemiquaver (British) is a note played for half the duration of a thirty-second note (or demisemiquaver), hence the name. It first occurs in the late 17th century and, apart from rare occurrences of hundred twenty-eighth notes (semihemidemisemiquavers) and two hundred fifty-sixth notes (demisemihemidemisemiquavers), it is the shortest value found in musical notation .
Sixty-fourth notes are notated with a filled-in oval note head and a straight note stem with four flags. The stem is drawn to the left of the note head going downward when the note is above or on the middle line of the staff. When the note head is below the middle line the stem is drawn to the right of the note head going upward. Multiple adjacent sixty-fourth notes may have the flags connected with a beam.
A similar, but rarely encountered symbol is the sixty-fourth rest (or hemidemisemiquaver rest, shown on the right of the image) which denotes silence for the same duration as a sixty-fourth note.
Notes shorter than a sixty-fourth note are very rarely used, though the hundred twenty-eighth note (otherwise known as the semihemidemisemiquaver ) and even shorter notes, are occasionally found.
The names of this note (and rest) vary greatly in many languages:
Language
note name
rest name
Basque
erdifusa
Catalan
semifusa
silenci de semifusa
Chinese
六十四分音符 ( pinyin: liùshísìfēn yīnfú)
六十四分休止符 ( pinyin: liùshísìfēn xiūzhǐfú)
Danish
fireogtresindstyvendedelsnode
fireogtresindstyvendedelspause
Dutch
vierenzestigste noot
vierenzestigste rust
French
quadruple-croche
seizième de soupir
German
Vierundsechzigstelnote
Vierundsechzigstelpause
Greek
εξηκοστό τέταρτο
παύση εξηκοστού τέταρτου
Italian
semibiscroma
pausa di semibiscroma
Korean
64분음표(六十四分音標 yuksipsabun eumpyo)
64분쉼표(六十四分-標 yuksipsabun swimpyo)
Norwegian
sekstifiredelsnote
Polish
sześćdziesięcioczwórka
pauza sześćdziesięcioczwórkowa
Portuguese
semifusa
pausa de semifusa
Russian
шестьдесят четвертая нота
шестьдесят четвертая пауза
Serbian
šezdesetčetvrtin(k)a / шездесетчетвртин(к)а
šezdesetčetvrtinska pauza / шездесетчетвртинска пауза
Spanish
semifusa
silencio de semifusa
"Semifusa" derives from the mensural notation corresponding to the modern sixteenth note.