Where does “القاعده” come from?

القاعده (Persian) comes from Arabic الْقَاعِدَة, from Arabic قَاعِدَة — rule, principle; foundation, base.

Ancestry of “القاعده”, step by step

Step	Language	Word	Meaning
1	Arabic	الْقَاعِدَة	—
2	Arabic	قَاعِدَة	rule, principle; foundation, base

القاعده — Etymology, Origin & Word History | Etymology Explorer