Meaning & use
nonillionth
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Next after the nonillion-and-eighth in a series; also, one of the equal parts of a whole obtained by dividing it by a nonillion (10 to the 30th power in the short scale).
See it in a sentence
The probability of the event was estimated at roughly one nonillionth.
Physicists sometimes deal with quantities so tiny they are measured in nonillionths of a unit.
A note on using this word
Formed like other ordinal number words (billionth, trillionth) from "nonillion," itself built from the Latin prefix "nona-" (nine) plus "-illion."
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