Where does “のだ” come from?

のだ (Japanese) comes from Japanese だ, from Japanese である, from Japanese で, from Japanese ぜ, from Japanese ぞえ, from Japanese え, from Middle Chinese 衣.

のだ (Japanese): an assertion that emphasizes the cause, reasons, grounds and etc

Definitions

  1. an assertion that emphasizes the cause, reasons, grounds and etc

Ancestry of “のだ”, step by step

のだ traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1JapaneseFollowing parts of speech that do not inflect by...
2JapaneseであるTo be: the copula, with the same function as だ and its polite form です
3Japaneseat; with, by, using; indicating the following...
4Japanesesentence-ending particle signifying emphasis,...
5Japaneseぞえ­ sentence-ending particle signifying emphasis, used to lightly press one's point, with affectionate overtones
6JapaneseAlternative form of い
7Middle Chinese

via Japanese

StepLanguageWordMeaning
1Japanesegenitive case marker; nominative case marker in a...
2Old Japaneseplain, field
3Middle Chinesetalent, ability
Every word from Middle Chinese Every word from Japanese Every word from Japanese ぞえ
のだ — Etymology, Origin & Word History | Etymology Explorer