squillion Share definition Flag A word which can be used to indicate a large amount of some thing. Much larger than a million but smaller than a zillion I've got a squillion tadpoles in my garden. There must be a squillion ants in my undies! squillion by ~*~Ambz~*~ April 18, 2006 0 0 Get merch Get the squillion mug. Buy Now — $32.95 See more merch