Where does “3ªs” come from?

3ªs (Portuguese) comes from Portuguese terceiras, from Portuguese terceiro, from Old Portuguese terçeiro, from Latin tertiārius, from Latin tertius, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

3ªs (Portuguese): feminine plural of 3º

Definitions

feminine plural of 3º

Ancestry of “3ªs”, step by step

Step	Language	Word	Meaning
1	Portuguese	terceiras	feminine plural of terceiro
2	Portuguese	terceiro	third
3	Old Portuguese	terçeiro	—
4	Latin	tertiārius	containing a third part
5	Latin	tertius	third, the ordinal number after secundus and...
6	Latin	trēs	three; 3
7	Proto-Italic	trēs	three
8	Proto-Indo-European	*tréyes	—

Every word from Proto-Indo-European *tréyes →Every word from Proto-Italic trēs →Every word from Latin trēs →