名詞 billion:

1. 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
   同義詞：one million million, 1000000000000
2. a very large indefinite number (usually hyperbole)
   同義詞：million, trillion, zillion, jillion
3. the number that is represented as a one followed by 9 zeros
   同義詞：one thousand million, 1000000000

形容詞 billion:

1. denoting a quantity consisting of one thousand million items or units in the United States
2. denoting a quantity consisting of one million million items or units in Great Britain

1. Some computers can perform over a billion computation a second.
   有些計(jì)算機(jī)一秒鐘能完成超過(guò)十億次運(yùn)算。
2. As a rule of thumb, a one-cent-a-gallon gasoline tax raises$1 billion. Oil producers in President-elect Bush's adopted state of Texas, however, would rather see a tax on imported crude oil.
   一般情形是，每加侖加汽油一分錢(qián)的稅可以征收10億元?？墒?，在布什第二家鄉(xiāng)德克薩斯州的產(chǎn)油商寧愿看見(jiàn)在進(jìn)口原油上征稅。
3. The human brain contains several billion nerve cells, which are connected with one another by fine nerves.
   人類(lèi)的大腦含有幾十億個(gè)神經(jīng)細(xì)胞，這些細(xì)胞由纖細(xì)的神經(jīng)將彼此連接起來(lái)。
4. It took them more than one billion dollars to complete the project.
   完成這個(gè)工程花費(fèi)了他們十億多美元。

bil.lion

n.Abbr. b.（名詞）縮寫(xiě) b.
The cardinal number equal to 09.
十億：基數(shù)，等于09
Chiefly British The cardinal number equal to 02.
【多用于英國(guó)】 基數(shù)，等于02
An indefinitely large number.
不確定的大數(shù)字

來(lái)源：
French [a million million]
法語(yǔ) [十萬(wàn)億]
blend of bi- [second power] * see bi-
混合了 bi- [第二力量] *參見(jiàn) bi-
million
million

【引伸】
bil.lion
adj.（形容詞）
pron.（代詞）