Octillion

Part of speech: noun

Pronunciation: /ɒkˈtɪl.iː.ən/

Definitions

1. A large number denoting one followed by 27 zeros, typically utilized in scientific notation
2. A value representing ten raised to the 27th power, frequently appearing in mathematical calculations
3. A numeral representing one and 27 zeros, used to describe immense quantities

Etymology: The name "octillion" follows a pattern that was once a serious proposal rather than a joke. The "-illion" ending comes from "million," and the prefix "oct-" means "eight," so the word's arithmetic is built into its form: the number is a million multiplied by itself, with the prefix counting the powers. Under the system that gave it its name, the terms climb by a thousandfold for every step in the sequence, so the names follow the pattern rather than the number of zeros being counted from a single base. The word reached English from French, where "octillion" was formed on the same model as "million," "billion" and "trillion." The French formation is the immediate source, and the English word simply took it over. Its Latin-derived prefix, "oct-," appears in familiar words such as "octagon" and "octave," which both carry the sense of eight. Its meaning is precise in a way many large-number words are not: it names one followed by 27 zeros. Scientists writing in scientific notation rarely use the name, preferring powers of ten, but the word remains part of the vocabulary for large quantities.