zillion

noun, plural zil·lions, (as after a numeral) zil·lion.

1. an extremely large, indeterminate number.

adjective

2. of, relating to, or amounting to a zillion.

noun plural -lions or -lion

1. (often plural) an extremely large but unspecified number, quantity, or amountzillions of flies in this camp

determiner

2. 1. amounting to a zilliona zillion different problems
   2. (as pronoun)I found a zillion under the sink

n.

1944, arbitrary coinage with no definite numerical value; first recorded in Damon Runyon.