Meaning of "quantitas terminata"

Salvete!

I need a little help with the expression quantitas terminata. I stumbled upon it in a sort of preface to Schott’s Cursus Mathematicus dealing with the etymology of the name of mathematics and its nature. A little bit of context:

I just do not understand what quantitas terminata is supposed to mean in this context. Isn’t any science terminata, i.e. restricted? What does it mean?

Valete,

Carolus Raeticus

terminata quantitas versus quantitatem indeterminatam
Anglicè est “bounded entity or quantity (which is measurable)” vs. “unbounded or indeterminate entity or quantity”

Salve Adriane!

Thank you for the hint.

Vale,

Carolus Raeticus