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Definition of: septillion
(sep·til′yən) noun
A cardinal number: in the French system and in the United States, 1 followed by 24 ciphers; in the English system, 1 followed by 42 ciphers.
—adjective Numbering a septillion. [<F septillion <L sept(em) + F (m)illion a million]
—sep·til′·lionth adjective & noun
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