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]

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.