Where does “sesquialtera” come from?

sesquialtera (English) comes from Latin sēsqui-, from Latin -que, from Proto-Italic -kʷe, from Proto-Indo-European -kʷe — and; Forms distributives from interrogatives.

sesquialtera (English): A ratio of 3:2; An organ stop that uses two ranks...

Definitions

A ratio of 3:2; An organ stop that uses two ranks...

Ancestry of “sesquialtera”, step by step

Step	Language	Word	Meaning
1	Latin	sēsqui-	1½; 1½ times, increased by 50%
2	Latin	-que	and, a copulative particle affixed to the word it...
3	Proto-Italic	-kʷe	and; Forms distributives from interrogatives
4	Proto-Indo-European	-kʷe	and; Forms distributives from interrogatives

Every word from Proto-Indo-European -kʷe →Every word from Latin -que →Every word from Latin sēsqui- →