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nounthe number that is represented as a one followed by 18 zerostype of:
Definition that contains quintillion
- trillion one quintillion in Great Britain
- one-quintillionth one part in a quintillion equal parts
- quintillionth one part in a quintillion equal parts
- quintillionth the ordinal number of one quintillion in counting order
- attosecond one quintillionth (10^-18) of a second; one thousandth of a femtosecond