Back-formation frommillion, then used inbillion,trillion,quadrillion, each fromFrench, ultimately from Italianmille(“thousand”) and the augmentative suffix-one.-illion was segmented frommillion as ifmi- was a prefix, and-illion the stem.

-illion

1. Combined with Latin prefixes for names of integers in order to form names ofpowers of a million.

   ‎bi- + ‎-illion → ‎billion

   ‎tri- + ‎-illion → ‎trillion

2. Added to various nonsense syllables to indicate an arbitrarily very large number.

   bajillion,gazillion

• The words formed with this suffix may mean either${\displaystyle 1,000,{000}^n}$ or${\displaystyle {1000}^{n+1}}$ in different nations and languages. Hencebillion can mean “one million million” or “one thousand million”. SeeLong and short scales on Wikipedia.Wikipedia

• -illiard

• Indefinite and fictitious numbers on Wikipedia.Wikipedia

Back-formation frommillion, ultimately from Italianmille(“thousand”) and the augmentative suffix-one.-illion was segmented frommillion as ifmi- was a prefix, and-illion the stem.

• IPA^(key): /i.ljɔ̃/

-illion m (plural-illions)

1. -illion

• -illiard

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