number/bi.ljɔ̃/
trillion (10¹²); billion (10⁹)
Synonyms: mille milliards, milliard
From bi- (“two”) + -illion; i.e., a million million. Coined by Jehan Adam in 1475 as by-million. Rendered as byllion by Nicolas Chuquet in 1484, in his article “Triparty en la science des nombres”.