1. (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
2. (noun) trillion, one million million million
the number that is represented as a one followed by 18 zeros
Synonyms: trillion, one million million million, billion, one million million, gazillion, million, jillion, zillion
Antonyms: ordinal
3. (adj) trillion, one million million, 1000000000000
the number that is represented as a one followed by 12 zeros
Synonyms: trillion, one million million million, billion, one million million, gazillion, million, jillion, zillion
Antonyms: ordinal
4. (adj) trillion
one quintillion in Great Britain
Antonyms: ordinal
5. (adj) trillion
one million million in the United States
Antonyms: ordinal
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Synonyms and Antonyms of trillion 
