[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.