Where does “twothirds” come from?

twothirds (English) comes from English third, from Middle English thirde, from Old English þridda, from Proto-West Germanic *þriddjō, from Proto-Germanic þridjô, from Proto-Indo-European tretyós, from Proto-Indo-European tr̥tyós, from Proto-Indo-European tréyes — three.

twothirds (English): Two thirds; the amount or proportion...

Definitions

  1. Two thirds; the amount or proportion...

Ancestry of “twothirds”, step by step

twothirds traces back through two separate lines of ancestry.

via English third

StepLanguageWordMeaning
1EnglishthirdThe ordinal form of the cardinal number three;...
2Middle Englishthirde—
3Old Englishþriddathird
4Proto-West Germanic*þriddjōthird
5Proto-Germanicþridjôthird
6Proto-Indo-Europeantretyós—
7Proto-Indo-Europeantr̥tyósthird
8Proto-Indo-Europeantréyesthree

via English two

StepLanguageWordMeaning
1EnglishtwoA numerical value equal to 2; this many dots;...
2Middle Englishtwotwo
3Old Englishtwātwo
4Old Englishtwēġentwo; twain
5Proto-West Germanictwai-two
6Proto-Germanictwaitwo
7Proto-Indo-Europeandwóh₁two
Every word from Proto-Indo-European tréyes →Every word from Proto-Indo-European tr̥tyós →Every word from Proto-Indo-European tretyós →