the fifth letter of the Greek alphabet (E, ε).
the consonant sound represented by this letter.
Mathematics. an arbitrarily small quantity, used to indicate that a given quantity is small, or close to zero.
First recorded in 1400–50; from Greek e psīlón “bare, simple e ” (as opposed to diphthongal spellings which in later Greek represented the same sound)
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Using JWST's mid infrared instrument MIRI, the team directly imaged Epsilon Indi Ab.
From Science Daily • Apr. 22, 2026
At the University of Miami, inside the columned fraternity house of Sigma Alpha Epsilon, one brother had some valuable information.
From The Wall Street Journal • Mar. 6, 2026
Named Epsilon Indi, the star is the smallest and coolest dwarf star yet observed with solar-like oscillations -- "starquakes" like those shown by the Sun.
From Science Daily • Mar. 26, 2024
Japan's recent space-related efforts have faced other setbacks, with the launch failure of the Epsilon small rocket in October 2022, followed by an engine explosion during a test last month.
From Reuters • Aug. 28, 2023
One hundred and seven heat-conditioned Epsilon Senegalese were working in the foundry.
From "Brave New World" by Aldous Huxley
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
