Definitions

1. adjective

being or coming next after a zillion in a numerical sequence.

“The zillionth anniversary celebration of the company was attended by thousands of people.”

2. noun

a numerical position in a sequence that is extremely large but indefinite.

“The zillionth page of the book was the last one to be published.”

3. adverb

to a degree that is extremely large but indefinite.

“The company has grown to an unimaginable zillionth degree over the years.”