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googolplex

/ˈɡuːɡəlplɛks/

Ten raised to the power of a googol

From American English googol (The number 10¹⁰⁰).

noun
adjective
googol
American English, 1938
googol
Coined name for 10¹⁰⁰, reportedly invented by nine-year-old Milton Sirotta.
English mathematical vocabulary
googol
Used as the base number in naming the vastly larger googolplex.
-plex
American English, 1938
-plex
Inventive combining element added by Edward Kasner to suggest a powerful numerical extension.
English mathematical vocabulary
-plex
Functions in googolplex as a playful suffix meaning an immense multiplication or expansion.
Combined
googolplex
Edward Kasner combined googol with the playful suffix -plex for 10^(googol).
American English, 1938 onward
googolplex
The name entered mathematical and popular language for an unimaginably large number.
Modern English
googolplex

In 1938, mathematician Edward Kasner asked his nine-year-old nephew Milton Sirotta to name the number 1 followed by 100 zeros. Milton reportedly answered “googol,” a word with the clean, comic sound of a child inventing a monster. Kasner then needed a name for something even more absurd: 10 raised to the power of a googol, so he attached the playful ending “-plex.” The result is not merely huge; writing it out would require more zeros than there are particles one could conveniently gather in the observable universe. The word later became easy to confuse with “Google,” whose name was itself inspired by googol—so a child’s joke about numbers is now entangled with the name of the world’s most famous search engine.

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