noun
epsilon
ehp-SEYE-luhn
noun
1
The fifth letter of the Greek alphabet (ε, Ε), between delta and zeta.
"The professor labeled the angle epsilon in her diagram."
2
Math/science: a symbol for an arbitrarily small positive quantity.
"For any epsilon greater than zero, we can find a value of n that satisfies the inequality."
How to Use Epsilon
Learner’s notesIn plain EnglishA Greek letter, often used in math to mean "a tiny amount."
Common pairings
epsilon greater than zero
the letter epsilon
Word Forms
epsilons plural, epsila plural
Study it as flashcards or scroll it in Flow — saved to your collection.
Test yourself on “epsilon”
A quick quiz — meaning, synonyms & usage
→
Fill the Gap
Can you complete this real example?
The professor labeled the angle _____ in her diagram.
Etymology
From Greek e psilón, "plain e" — distinguishing it from the diphthong sound written with other letters.