Sesquialtera ('one and a half') may refer to:
* Sesquialterum in mathematics, the ratio 3:2, a
superparticular ratio
* Sesquialtera or the equivalent Greek term
hemiola, three in the time of two as variously used in music theory:
** Sesquialtera commonly describes a
tempo proportion in
mensural notation
** Hemiola is more common for the temporary substitution of a 2+2+2
musical meter
In music, metre (British English, Commonwealth spelling) or meter (American and British English spelling differences#-re, -er, American spelling) refers to regularly recurring patterns and accents such as bar (music), bars and Beat (music), beats ...
for 3+3
*
Sesquialtera (organ stop), combining mutation ranks at 2' and 1', i.e. both 3:2 and 5:4 pitch ratios
*
''Sesquialtera'' (moth), a genus of moth in the family Geometridae
{{disambiguation