One who belongs to the lowest caste in Aldous Huxley's book Brave New World. Known for stunted growth, inferior intelligence, yet indispensibility. After death, they play a crucial role in phosphate reclamation. In short, a useful idiot.

Also known as "Epsilon-minus semi-moron"
Everyone works for everyone else. We can't do witout anyone. Even Epsilons are useful. We couldn't do without Epsilons.
by Douglas Weltman June 29, 2003
1) A really really small positive number (i.e. 0.00000001)
2) The fifth letter of the greek alphabet
3) What mathematicians such as Paul Erdos call little kids; a beautiful use of definition #1
"That's a cute epsilon! Is it a boss or a slave?" - Paul Erdos, Hungarian mathematician (obtained from 'The Man who loved Only Numbers')
by Sasha Ramani September 7, 2005
1. A small quantity.

2. Something that can be safely overlooked.

3. Something very small.
1. These french fries need epsilon more salt.

2. Ignore the tax, it is just an epsilon.

3. What a cute little epsilon!
by node-edon April 3, 2006
fifth letter of the greek alphabet. tremendously epic. Often used as an exclamation, especially with regards to mathematical accomplishments.
bruh rumor has it that the mathemagician just pulled another epsilon

ok this is epic
by doiajsifdnjknakjnds May 30, 2019
A joker and a spammer, Very annoying to others. Born with artistic skills
code name #9
by epsilon December 1, 2003
noun - an autistic vaccinated fluoride head/fluoridated vaccine head child as a reference to Aldous Huxley's "Brave New World" class of skilled but non-communicative workers
With the current rate of vaccine related autism the epsilons will outnumber the rest by 2025.
by badintense August 3, 2015
A high level candidate for the order of NoyNoy (headquarter in Gothenburg, Sweden)
hey! Epsilon get over here and make me a drink. You are no NoyNoy yet.
by beskrivningsbyrans mastare March 27, 2010