Quintillion Definition

kwĭn-tĭlyən

noun

The cardinal number equal to 10¹⁸ .

American Heritage

The number represented by 1 followed by 18 zeros.

Webster's New World

The number represented by 1 followed by 30 zeros.

Webster's New World

The cardinal number equal to 10³⁰ .

American Heritage

(figuratively, slang) Any very large number, exceeding normal description.

Wiktionary

adjective

Amounting to one quintillion in number.

Webster's New World

Other Word Forms of Quintillion

Singular:

quintillion

Plural:

quintillions

quint- (“five") +"Ž -illion; ie the fifth power of a million, 10³⁰.

From Wiktionary
Latin quīntus fifth penkwe in Indo-European roots (m)illion

From American Heritage Dictionary of the English Language, 5th Edition

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