Where does “certa” come from?

certa (Portuguese) comes from Portuguese certo, from Old Portuguese certo, from Latin certus, from Proto-Indo-European krey- — to sift, separate, divide.

certa (Portuguese): feminine singular of certo

Definitions

feminine singular of certo

Ancestry of “certa”, step by step

Step	Language	Word	Meaning
1	Portuguese	certo	right; correct not containing errors
2	Old Portuguese	certo	—
3	Latin	certus	certain; fixed, settled, firm; resolved,...
4	Proto-Indo-European	krey-	to sift, separate, divide

Every word from Proto-Indo-European krey- →Every word from Latin certus →Every word from Old Portuguese certo →