Where does “alternator” come from?

Alternator comes from English alternate, from Latin alterno meaning to make other or change by turns, ultimately from Latin alter meaning other and ad meaning to.

alternator (English): An electric generator which produces alternating...

Definitions

  1. An electric generator which produces alternating...

Ancestry of “alternator”, step by step

alternator traces back through two separate lines of ancestry.

via English ‐or

StepLanguageWordMeaning
1English‐orCreates an agent noun, often from a verb, indicating a person or object (often machines or parts of them) that do the verb or part of speech with which they are formed
2Middle English-our
3Old French-eorAlternative form of -or
4Latin-ator-ator, -er; second-person singular future passive...
5Latin-tor-er
6Proto-Italic-tōrForms agent nouns to verb stems
7Proto-Indo-European-tōrDerives agent nouns from verbs, denoting someone...
8Proto-Indo-European-tor-s

via English alternate

StepLanguageWordMeaning
1EnglishalternateHappening by turns; one following the other in...
2Latinalternātusalternated, vacillated
3Latinalternōto do one thing and then another, do by turns, interchange, alternate
4Latinalternusalternate (one after the other), successive
5Latinalterthe other, the second; the one...the other
6Proto-Indo-Europeanh₂élterosother , second
7Proto-Indo-Europeanh₂el-to grow, nourish; beyond, other; to wander, roam

Words derived from “alternator

Every word from Proto-Indo-European -tor-s
alternator — Etymology, Origin & Word History | Etymology Explorer