quintillionth

Noun
  1. One part in a quintillion equal parts (synset 113762191)
    is a type of: common fraction, simple fraction - the quotient of two integers
    same as: one-quintillionth
Adjective
  1. The ordinal number of one quintillion in counting order (synset 302220698)
    similar to: ordinal - being or denoting a numerical order in a series

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