Sesquiquartum refers to the improper vulgar fraction In arithmetic, a vulgar fraction (or common fraction) consists of one integer divided by a non-zero integer. ...

The sesquiquartum in musical harmony is the ratio corresponding to the interval ditonus. Harmony is the use and study of pitch simultaneity and chords, actual or implied, in music. ... In harmony, the ditonus (Latin for double tone — plural ditoni) is the ratio 5:4 (sesquiquartum) between a pair of frequencies or, equivalently, the ratio 4:5 between a pair of wavelengths. ...

See also: It is also a really big word and annoys me sesquialterum, sesquitertium, sesquiquintum. Sesquialterum (plural: sesquialtera) or sesquialter refers to the improper rational fraction . It is a superparticular number. ... Sesquitertium refers to the improper rational fraction It is a superparticular number. ... Sesquiquintum (Latin neuter) (masculine: sesquiquintus) refers to the improper rational fraction It is a superparticular number. ...