Where does “auto” come from?

auto (Portuguese) comes from Portuguese automóvel, from Portuguese Auto-, from Ancient Greek αὐτός, from French mobile, from Latin mōbilis, from Latin -bilis, from Proto-Italic -ðlis, from Proto-Indo-European -dʰlis — Alternative form of *-trom; instrumental suffix;...

auto (Portuguese): a public deed or ceremony; auto; act; deed

Definitions

  1. a public deed or ceremony; auto; act; deed

Ancestry of “auto”, step by step

auto traces back through two separate lines of ancestry.

via Portuguese automóvel

StepLanguageWordMeaning
1Portugueseautomóvelautomobile
2PortugueseAuto-self-; auto- done by or directed at oneself
3Ancient Greekαὐτόςαὐτή f, αὐτό n; "first/second declension";...
4Frenchmobilemobile; moving; movable
5Latinmōbilismovable, loose
6Latin-bilis-ble
7Proto-Italic-ðlisForms adjectives from verb stems indicating capacity or worth of being acted on
8Proto-Indo-European-dʰlis
9Proto-Indo-European-dʰlomAlternative form of *-trom; instrumental suffix;...

via Latin āctus

StepLanguageWordMeaning
1Latināctusmade, done, having been done
2Latinagōto act, to behave
3Proto-Italicagōdrive; push, impel; do, act
4Proto-Indo-Europeanh₂éǵetito be driving
5Proto-Indo-Europeanh₂eǵ-to drive

Words derived from “auto

Every word from Proto-Indo-European -dʰlomEvery word from Latin -bilisEvery word from Latin mōbilis