Wiktionary
n. (context music English) A musical notation that indicates the relative duration of a note, using the color or shape of the note head, the presence or absence of a stem, and the presence of flags.
WordNet
n. (music) the relative duration of a musical note [syn: value, time value]
Wikipedia
In music notation, a note value indicates the relative duration of a note, using the color or shape of the note head, the presence or absence of a stem, and the presence or absence of flags/ beams/hooks/tails.
A rest indicates a silence of an equivalent duration.
Note
Rest
American name
British name
Value
With Dotted value
With Double Dotted Value
With Triple Dotted Value
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large, duplex longa, or maxima
(occasionally octuple note, octuple whole note, or octuple entire musical note)
8
8 + 4
8 + 4 + 2
8 + 4 + 2 + 1
long or longa
(occasionally quadruple note or quadruple whole note)
4
4 + 2
4 + 2 + 1
4 + 2 + 1 + 1/2
double whole note, double note
breve
2
2 + 1
2 + 1 + 1/2
2 + 1 + 1/2 + 1/4
semibreve
1
1 + 1/2
1 + 1/2 + 1/4
1 + 1/2 + 1/4 + 1/8
minim
1/2
1/2 + 1/4
1/2 + 1/4 + 1/8
1/2 + 1/4 + 1/8 + 1/16
or
crotchet
1/4
1/4 + 1/8
1/4 + 1/8 + 1/16
1/4 + 1/8 + 1/16 + 1/32
quaver
1/8
1/8 + 1/16
1/8 + 1/16 + 1/32
1/8 + 1/16 + 1/32 + 1/64
semiquaver
1/16
1/16 + 1/32
1/16 + 1/32 + 1/64
1/16 + 1/32 + 1/64 + 1/128
demisemiquaver
1/32
1/32 + 1/64
1/32 + 1/64 + 1/128
1/32 + 1/64 + 1/128 + 1/256
hemidemisemiquaver
1/64
1/64 + 1/128
1/64 + 1/128 + 1/256
1/64 + 1/128 + 1/256 + 1/512
hundred twenty-eighth note
semihemidemisemiquaver (rare)
1/128
1/128 + 1/256
1/128 + 1/256 + 1/512
1/128 + 1/256 + 1/512 + 1/1024
two hundred fifty-sixth note
demisemihemidemisemiquaver (rare)
1/256
1/256 + 1/512
1/256 + 1/512 + 1/1024
1/256 + 1/512 + 1/1024 + 1/2048