Definition of sesquialtera in English:

sesquialtera

Syllabification: ses·qui·al·tera
Pronunciation: /ˌseskwiˈaltərə
 
/

adjective

[attributive] Music
1Relating to or denoting a ratio of 3:2, as in an interval of a fifth.
1.1Denoting an organ stop typically consisting of two ranks of narrow-scaled open flue pipes.

Origin

late Middle English: from Latin, feminine of sesquialter, from sesqui (see sesqui-) + alter 'second'.

Definition of sesquialtera in:

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Pronunciation: nēˈätn-ē
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retention of juvenile features in the adult animal