The Hitch Hiker's Guide to the Galaxy offers this definition...

The Hitch Hiker's Guide to the Galaxy offers this definition of the word "Infinite". Infinite: Bigger than the biggest thing ever and then some. Much bigger than that in fact, really amazingly immense, a totally stunning size, "wow, that's big", time. Infinity is just so big that by comparison, bigness itself looks really titchy. Gigantic multiplied by colossal multiplied by staggeringly huge is the sort of concept we're trying to get across here.