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)

billˈionth adjective and noun

• on trial
• on trust
• onus
• onuses
• onus probandi
• on velvet
• on view
• onward
• onwardly
• onwards
• on wings
• onycha
• onychas
• onychia
• onychias
• onychite
• onychites
• onychitis
• onychitises
• onychium
• onychiums
• onychocryptoses
• onychocryptosis
• onychomancies
• onychomancy