English edit

Etymology edit

zillion +‎ -th

Pronunciation edit

Adjective edit

zillionth (not comparable)

  1. (informal) The ordinal form of the number zillion.

Noun edit

zillionth (plural zillionths)

  1. (informal) The person or thing in the zillionth position.
  2. (informal) One of a zillion equal parts of a whole.