Definition of epsilon
1 : the 5th letter of the Greek alphabet — see alphabet table
2 : an arbitrarily small positive quantity in mathematical analysis
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Recent Examples of epsilon from the Web
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Based on the Greek letter epsilon, the euro symbol represents the coming together of nations.
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Origin and Etymology of epsilon
Greek e psilon, literally, simple e
Learn More about epsilon
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See words that rhyme with epsilon Britannica.com: Encyclopedia article about epsilon
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