epsilon
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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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