D defs.my
Entry 1 sense Webster, 1913

Billion

/bĭl'yən/ · Bil·lion · IPA /ˈbɪ(l)jən/
01 n. According to the French and American method of numeration, a thousand millions, or 1,000,000,000; according to the English method, a millio…
  1. 1.
    According to the French and American method of numeration, a thousand millions, or 1,000,000,000; according to the English method, a million millions, or 1,000,000,000,000. See Numeration. See: Numeration