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quintillion

A number, 1,000,000,000,000,000,000 or 10^18.
There are a quintillion drops of water in the lake.
by 5'1"Racer April 29, 2005
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Quintillion

A large number. Comes after quadrillion.
It has 21 zeros
1,00,000,000,000,000,000,000

quint- (“five”) + -illion; ie the fifth power of a million, 10.30.
After Quintillion comes sextillion, then septillion ect.
by sharks445 September 25, 2011
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Quintillion

1. A number with 18 zeros behind it.
1,000,000,000,000,000,000-Quintillion
by MACHaraina January 21, 2016
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quintillion googleplexes worth of seggers

A term used to represent the enormous amount of problems in programming while encountering numerous seggers

See quintillion googleplex, segger
So I was programming the other day and I got a quintillion googleplexes worth of seggers!
by GhettoDefined June 9, 2004
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quintillional

Pronunciation: /kwɪnˈtɪl.jə.nəl/
Definition:
1. The ordinal number symbol: 1,000,000,000,000,000,000.
2. The position in a sequence following the quintillion elements.
3. Pertaining to a magnitude of divisibility so vast, it is primarily conceptual, used in exascale computing, cryptography, and theoretical mega-astronomy.
4. Denoting a scale relevant to total possible computational operations, cryptographic spaces, or estimations of fundamental particles in the observable universe.

Significance:
• It defines the quintillionth position with systematic regularity and clarity.
• It emphasizes exascale computation, cryptographic security, and cosmic-scale enumerations.
• It identifies the order of magnitude for brute-force attack spaces in post-quantum cryptography, the number of discrete operations in exascale simulations, and estimates of subatomic particles in cosmology.
• It avoids irregular and ambiguous pronunciations.
• It simplifies expressions of near-incomprehensible scale in information theory, advanced cryptography, and hyper-computational models.
• It improves precision in discussions of cryptographic entropy, the limits of classical computation, and grand unified physical constants.
• It replaces Scandinavian-Germanic, Non-American, foreign, and Anglo-Saxon terms, similar to replacing "quintillionth".
Adjective: quintillional
Ordinal number: quintillional (1,000,000,000,000,000,000th)
Cardinal number: quintillion (1,000,000,000,000,000,000)
Examples:
• "The encryption key space is on the order of quintillional possibilities, making brute-force attacks infeasible."
• "An exascale computer can perform a quintillional operations per second."
• "Some estimates place the number of fundamental particles in the observable universe at roughly one quintillional."
• "The probability of that cosmic event recurring identically is less than one quintillional."
• "The simulation required quintillional discrete time-steps to model the phenomenon accurately."
by Dmitrio January 13, 2026
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