Where does “bastió” come from?

bastió (Catalan) comes from Italian bastione, from French bastion, from Middle French bastion, from Old French bastille — fortress.

bastió (Catalan): stronghold

Definitions

Step	Language	Word	Meaning
1	Italian	bastione	bastion; battlements
2	French	bastion	bastion; stronghold
3	Middle French	bastion	—
4	Old French	bastille	fortress

bastió — Etymology, Origin & Word History | Etymology Explorer