köken: From Middle Persian 𐭩𐭠𐭥𐭩𐭲𐭠 (yʾwyt' /jāwēd/, “eternal”). Compare Old Armenian յաւէտ (yawēt), an Iranian borrowing. compare Avestan 𐬫𐬀𐬎𐬎𐬀𐬈-𐬘𐬍- (yauuae-jī-, “living forever”). Ultimately from Proto-Indo-European *h₂óyu and *gʷeyh₃-.
an extremely long period of time · raising ones hands · business troubles, bankruptcy
köken: Shift in reading from 万(ばん)歳(ぜい) (banzei) below, keeping the older goon reading for the second character and adopting the relatively newer kan'on reading for the first character. Doublet of マンセー (mansē).