epsilon Hear it!

epsilon definition

ep·si·lon (ep′sə län′, -lən)

noun

the fifth letter of the Greek alphabet (Ε, ε)

Etymology: LGr e psilon, lit., plain e: so named to distinguish it from ai, which had come to have the same pronun.

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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