A very, very rich person. Since it rhymes with 'million' and 'billion, 'zillion' sounds huge, although it's not really a number.' A 'zillionaire' is like a 'millionaire' or a 'billionaire' but with even more money. eg:Someday I'll be a zillionaire, just like Bill Gates! Note: Zillionaire的意思是非常富有的人。zillion虽然不是数字,但由于发音和million、billion很相似,人们根据millionaire和billionaire发明了Zillionaire一词,而且青出于蓝而胜于蓝,Zillionaire比前二者都更富有。