1. (noun) billion, one million million, 1000000000000
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
Synonyms: trillion, billion, zillion, one million million, gazillion, million, jillion, one thousand million
Antonyms: ordinal
2. (noun) million, billion, trillion, zillion, jillion, gazillion
a very large indefinite number (usually hyperbole)
Synonyms: one thousand thousand, one million million million, billion, meg, trillion, gazillion, million, one million million, one thousand million, jillion, zillion
Antonyms: ordinal
3. (adj) billion, one thousand million, 1000000000
the number that is represented as a one followed by 9 zeros
Synonyms: trillion, billion, zillion, one million million, gazillion, million, jillion, one thousand million
Antonyms: ordinal
4. (adj) billion
denoting a quantity consisting of one thousand million items or units in the United States
Antonyms: ordinal
5. (adj) billion
denoting a quantity consisting of one million million items or units in Great Britain
Antonyms: ordinal
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Synonyms and Antonyms of billion 
