Where does “troisième” come from?

troisième (French) comes from French trois, from Middle French troys, from Old French trois, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

troisième (French): third; third class

Definitions

third; third class

Ancestry of “troisième”, step by step

Step	Language	Word	Meaning
1	French	trois	three
2	Middle French	troys	three
3	Old French	trois	three
4	Latin	trēs	three; 3
5	Proto-Italic	trēs	three
6	Proto-Indo-European	*tréyes	—

Words derived from “troisième”

3e
troisièmement

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