1. 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.”
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Definitions of epsilon 
