Quadrillion

Part of speech: noun

Pronunciation: /kwɑˈdɹɪl.i.ən/

Definitions

1. A term for a number that equates to a thousand trillion A cardinal figure represented as 10 to the power of 15 Typically used in contexts involving immense data or theoretical calculations, especially in economics or computing
2. A numerical value representing one followed by fifteen zeros, commonly used in scientific and financial contexts
3. An extremely large number expressed as 1,000,000,000,000,000 often applied in discussions of vast quantities

Etymology: The number that "quadrillion" names was built on a pattern set by "million," which entered French in the 1400s. Adding "-illion" to a Latin-based prefix produced a family of names for powers of a million: "billion" for a million million, "trillion" for a million million million, and "quadrillion" for the next step up. The "quadri-" part comes from the Latin word for "four," which signals that the number is a million raised to the fourth power, or one followed by fifteen zeros. The word was formed in French and then carried into English, where it names the same value. Its structure is transparent: "quadri-" (four) joined to "-illion," the suffix that marks a power of a million. Because "million" itself is a French-influenced formation from Italian roots, the whole series reflects a deliberate system for naming very large numbers rather than an ancient inheritance.