septillion.
A trillion trillion: 1 followed by 24 zeros, 10²⁴.
Meaning & usage
A trillion trillion: 1 followed by 24 zeros, 10²⁴.
A billion quintillion: 1 followed by 42 zeros, 10⁴².
Where this word comes from
From French septillion, from sept- (“seven”) + -illion. By surface analysis, sept- + -illion.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.