billion /bilˈyən/

1. A thousand millions (10⁹)
2. (esp formerly, in Britain) a million millions (10¹²)
3. (loosely; esp in pl) a very great number (informal)
4. A billion pounds, dollars, etc

Being a billion in number

billionaire /-ārˈ/ noun

(also fem billionairˈess) a person with resources worth (more or less) a billion pounds, dollars, etc

billˈionfold adjective and adverb

(usu preceded by a or a numeral)

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