BILLION
billion
(adjective) denoting a quantity consisting of one thousand million items or units in the United States
billion
(adjective) denoting a quantity consisting of one million million items or units in Great Britain
billion, one thousand million
(noun) the number that is represented as a one followed by 9 zeros
billion, one million million
(noun) the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen
million, billion, trillion, zillion, jillion, gazillion, bazillion
(noun) a very large indefinite number (usually hyperbole); “there were millions of flies”
Source: WordNet® 3.1
Etymology
Noun
billion (plural billions)
(US, modern British & Australian, short scale) a thousand million (logic: 1,000 × 1,000^2): 1 followed by nine zeros, 109; a milliard
(dated, rare, British & Australian, long scale) A million million (logic: 1,000,000^2): a 1 followed by twelve zeros; 1012
(colloquial, hyperbole) An unspecified very large number.
Synonyms
• (109): thousand million
• (109): milliard
• (1012): trillion (short scale)
Source: Wiktionary
Bil"lion, n. Etym: [F. billion, arbitrarily formed fr. L. bis twice,
in imitation of million a million. See Million.]
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition