billion

nouns

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
1000000000000, billion, one million million
a very large indefinite number (usually hyperbole)
"there were millions of flies"
billion, gazillion, jillion, million, trillion, zillion
the number that is represented as a one followed by 9 zeros
1000000000, billion, one thousand million

adjectives

denoting a quantity consisting of one thousand million items or units in the United States
billion
is similar to
being or denoting a numerical quantity but not order
"cardinal numbers"
cardinal
domain region
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
America, U.S., U.S.A., US, USA, United States, United States of America, the States
denoting a quantity consisting of one million million items or units in Great Britain
billion
is similar to
being or denoting a numerical quantity but not order
"cardinal numbers"
cardinal
domain region
a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland