Search Result for "epsilon": 
Wordnet 3.0

NOUN (1)

1. the 5th letter of the Greek alphabet;

WordNet (r) 3.0 (2006):

epsilon n 1: the 5th letter of the Greek alphabet
The Jargon File (version 4.4.7, 29 Dec 2003):

epsilon [see delta] 1. n. A small quantity of anything. ?The cost is epsilon.? 2. adj. Very small, negligible; less than marginal. ?We can get this feature for epsilon cost.? 3. within epsilon of: close enough to be indistinguishable for all practical purposes, even closer than being within delta of. ?That's not what I asked for, but it's within epsilon of what I wanted.? Alternatively, it may mean not close enough, but very little is required to get it there: ?My program is within epsilon of working.?
The Free On-line Dictionary of Computing (30 December 2018):

EPSILON A macro language with high level features including strings and lists, developed by A.P. Ershov at Novosibirsk in 1967. EPSILON was used to implement ALGOL 68 on the M-220. ["Application of the Machine-Oriented Language Epsilon to Software Development", I.V. Pottosin et al, in Machine Oriented Higher Level Languages, W. van der Poel, N-H 1974, pp. 417-434]. [Jargon File] (1995-05-10)
The Free On-line Dictionary of Computing (30 December 2018):

epsilon within epsilon of 1. The fifth letter of the Greek alphabet. 2. (From the Hungarian mathematician Paul Erdos) A very small, insignificant, or negligible quantity of something. The use of epsilon is from the epsilon-delta method of proof in differential calculus. (2001-07-06)