Where does “aŭtuna” come from?

aŭtuna (Esperanto) comes from Esperanto aŭtuno, from French automne, from Old French automne, from Latin autumnus, from Latin auctumnus, from Proto-Indo-European h₃ewǵ- — cold.

aŭtuna (Esperanto): autumn

Definitions

autumn

Ancestry of “aŭtuna”, step by step

Step	Language	Word	Meaning
1	Esperanto	aŭtuno	autumn, fall
2	French	automne	autumn, fall
3	Old French	automne	autumn
4	Latin	autumnus	autumn, fall; autumn; autumnal
5	Latin	auctumnus	autumn; autumn; autumnal
6	Proto-Indo-European	h₃ewǵ-	cold

Every word from Proto-Indo-European h₃ewǵ- →Every word from Latin auctumnus →Every word from Latin autumnus →