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An indefinitely large number.
n, pl -lions or -lion
(often plural) an extremely large but unspecified number, quantity, or amount: zillions of flies in this camp.
a. amounting to a zillion: a zillion different problems.
b. (as pronoun): I found a zillion under the sink.
[C20: on the model of million]
n., pl. -lions, (as after a numeral) -lion. Informal.
an extremely large, indeterminate number.
[1930–35; jocular alter. of million, billion, etc.]
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|Noun||1.||zillion - a very large indefinite number (usually hyperbole); "there were millions of flies"|
|Adj.||1.||zillion - very large indeterminate number; "a zillion people were there"|
cardinal - being or denoting a numerical quantity but not order; "cardinal numbers"