Freedom extended to necessary acts is taken in a broader sense
They admit that when freedom is stretched to cover acts that are necessary and unchangeable, the word is being used in a broader sense.
Taken more strictly, freedom deals only with what is contingent: with what may turn out one way or the other.
Latin
IX. Quum autem libertas extenditur ad actus necessarios atque immutabiles, fatentur illam latiori significatione sumi; libertatem vero strictius acceptam versari tantum circa contingentia, & quae possunt sic, vel secus se habere.