Exact historical dictionary sense
Billion in Webster's 1913 dictionary
The 1913 record labels billion as noun. Its source-bounded etymology and selected historical definition appear below.
[F. billion, arbitrarily formed fr. L. bis twice, in imitation of million a million. See Million.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "billion" is labeled noun. Its etymology is recorded as: "[F. billion, arbitrarily formed fr. L. bis twice, in imitation of million a million. See Million.]" The selected historical definition says: "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."