Etymology
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septillion (n.)

in France and the U.S., "the eighth power of 1,000" (1 followed by 24 zeroes); in the British system of numeration, "1 million to the seventh power" (1 followed by 42 zeroes), 1680s, from sept- (see septi-) + word-forming element abstracted from million. Compare billion.

updated on May 14, 2022

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Definitions of septillion from WordNet

septillion (n.)
the number that is represented as a one followed by 24 zeros;
From wordnet.princeton.edu, not affiliated with etymonline.