出典:Wiktionary
出典:『Wiktionary』 (2026/02/10 00:31 UTC 版)
Back-formation from million, then used in billion, trillion, quadrillion, each from French, ultimately from Italian mille (“thousand”) and the augmentative suffix -one. -illion was segmented from million as if mi- was a prefix, and -illion the stem.
-illion