ε (EN)

letter, symbol

letter “ε”

1. the fifth letter of the Greek alphabet (epsilon)
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   In Greek writing, words like "ἐλπίς" (hope) begin with an ε.

symbol “ε”

1. (mathematics) an arbitrarily small positive number
   In calculus, we let ε be as small as needed to make the function values close to the limit.