vigintillionth

1. not comparableThe ordinal form of the number vigintillion

   What is called the proper understanding of human life is the realization that we are merely acting out the vigintillionth act...

   1956, Qing Hua Xue Bao [清華學報], Tsing Hua Journal of Chinese Studies, Guo Li Qing Hua Da Xue [National Tsing Hua University, 國立清華大學], Hsin-chu Shih [Hsinchu City, 新竹市], Taiwan, page 177

plural vigintillionths

1. The person or thing in the vigintillionth position.
2. One of a vigintillion equal parts of a whole.

   But on some real choice property the matter of any ownership at all was so valuable that bidders bid one-millionth, one-billionth, one-trillionth, etc., even up to one-vigintillionth! ...some courts held that one-vigintillionth was a legally recognizable incumbrance.

   1898, C. Amryc, Pantheism: The Light and Hope of Modern Reason, page 205

   1 more example

   1892 June–November, Stone, An Illustrated Magazine, volume v […] it seems to show that the trend of mechanical thought is toward simplicity of design rather than complexity, and that the sober second thought of the power user has rather discredited the profits to be made by saving the “vigintillionth” of a pound of coal per horse power per hour by an outlay of several thousand dollars.