noun ep·si·lon \ˈep-sə-ˌlän, -lən\

Definition of epsilon

  1. 1 :  the 5th letter of the Greek alphabet — see alphabet table

  2. 2 :  an arbitrarily small positive quantity in mathematical analysis


play \ˌep-sə-ˈlä-nik\ adjective

Origin and Etymology of epsilon

Greek e psilon, literally, simple e

First Known Use: 15th century

Learn More about epsilon

Seen and Heard

What made you want to look up epsilon? Please tell us where you read or heard it (including the quote, if possible).