From Longman Dictionary of Contemporary Englishzillionzil‧lion /ˈzɪljən/ noun [countable] informal LOT/LARGE NUMBER OR AMOUNTa very large number of thingsa zillion I’ve seen that movie a zillion times.zillions of something zillions of mosquitoes
Examples from the Corpus
zillion• After a lifetime and a zillion points, the inconceivable happened: Dusty notched up a record and retired to his farm.• It was a clever memento sent to half a zillion other loyal Democrats.• They can either produce a few we protected offspring or a zillion unprotected ones.• Does it end six zillion miles east of Poughkeepsie?zillions of something• There were zillions of mosquitoes in the woods.Origin zillion (1900-2000) Z as the last in a series + million 