The fifth letter of the Greek alphabet. See Table at alphabet.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "epsilon" in a sentence
"Let's look at the second number, epsilon, which is roughly .007."
"Hilbert developed a method for the study of consistency problems, called the epsilon substitution method, to deal with the quantifiers."
"The EKG may show inverted t waves in right sided leads and the so-called epsilon waves."